Question about Casio FX-115ES Scientific Calculator

I tried putting it in radian measure, but it just made the number bigger

When the angle unit is in radians

sin^-1(0.184)=0.1850543940 radians

When angle unit is in degrees

sin^-1(0.185)=10.60283581

Your calculator is calculating the functions correctly)

In the following screen captures the sine of the values is calculated with the unit specified inside the formula (degree symbol and radian symbol are inserted to show you the unit). In the last calculation the value of the sine is practically 0.184

**Remember that when angle is in radians**, for very small angles (less than 10 degrees), **sin(x) and tan (x) are about equal to the value of the angle in radians**

Posted on Mar 25, 2014

The arcsine of .184 is about .185 radians or 10.6 degrees (which your calculator seems to be giving you), while the arccosine of .184 is about 1.39 radians (which seems to be what you want) or 79.4 degrees.

To set radians mode, press SHIFT MODE 4.

To calculate the arcsine of .184, press SHIFT SIN . 1 8 4 =

What do you get? I get 0.185 .

To calculate the arccosine of .184, press SHIFT COS . 1 8 4 =

What do you get? I get 1.39 .

Posted on Mar 25, 2014

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Posted on Jan 02, 2017

SOURCE: sin, cos, or tan, on casio wrong answer. another cac right answer

Hello,

It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.

To set degree as default SHIFT MODE 3

To set radians as default SHIFT MODE 4

To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

Posted on Sep 17, 2009

SOURCE: why the cos of 90 is -0.44... ??

The trigonometric function evaluations depend on the angle unit you are using: degree, radian, grad

While cos(90 deg)= 0,

cos(90 rad )=cos(90* 180/pi degrees)= -.448073616

ALWAYS CHECK UNITS before using trigonometric functions or their inverse functions.

Posted on Jul 23, 2010

It means your calculator is currently set to measure angles in degrees.

There are three common units to measure angles. A full circle is 360 degrees, or 400 grads, or two pi radians. The results of the trigonometric functions depend on the current measure, just as you'd get different numbers if you measure a person's height in inches, feet, or meters.

There are three common units to measure angles. A full circle is 360 degrees, or 400 grads, or two pi radians. The results of the trigonometric functions depend on the current measure, just as you'd get different numbers if you measure a person's height in inches, feet, or meters.

Jul 15, 2014 | Texas Instruments TI 30XIIS Scientific...

It depends on the unit of measurement. The sine of one radian is about 0.84. The sine of one degree is about 0.017. The sine of one grad is about 0.015. From your numbers it looks like your calculator is set to grads when you want it to be in radians (and are you sure you want a negative number for the sine of one?).

Press the DRG key to cycle through the angular modes. One of the annunciators at the top of the display will light to indicate the current mode.

Press the DRG key to cycle through the angular modes. One of the annunciators at the top of the display will light to indicate the current mode.

Jan 31, 2014 | Sharp el-531x scientific calculator

Sorry I do not like to work with secant and cosecant.

sec(a)+tan(a)=(1+sin(a))/cos(a)

ln(sec(a)+tan(a))=** ln( (1+sin(a))/cos(a))=X**

2*cosh(X)= e^(X)+e^(-X)

**e^(X)=(1+sin(a))/cos(a)**

**e^(-X)= cos(a)/(1+sin(a))**

2cosh(X)=(1+sin(a))/cos(a) +cos(a)/(1+sin(a))= 2/cos(a)

**cosh(X)=1/cos(a)=sec(a)**

Now that you see how you can do it, I trust you will discover any mistake I might have made.

If you want to use the classPad function sequence**Action>Transformation>simplify(,** do it step by step as I have detailed above.

Good Luck.

sec(a)+tan(a)=(1+sin(a))/cos(a)

ln(sec(a)+tan(a))=

2*cosh(X)= e^(X)+e^(-X)

2cosh(X)=(1+sin(a))/cos(a) +cos(a)/(1+sin(a))= 2/cos(a)

Now that you see how you can do it, I trust you will discover any mistake I might have made.

If you want to use the classPad function sequence

Good Luck.

Dec 07, 2013 | Casio ClassPad 300 Calculator

Does it refuse to do so or does it give an error message?

Three common errors:

Three common errors:

- Not having the correct angle unit.
**Wrong result, No error message** - Confusing reciprocal of sine (1/sin(x) with arc sine (x) ,sin^-1(x). Confusing the reciprocal of cosine, 1/cos(x) with arc cosine (cos^-1(x)).
**Wrong result, No error message** - Taking the argument of the inverse sine and/or inverse cosine functions outside the interval [-1,1].
**This gives a domain error.**

Oct 28, 2013 | Texas Instruments TI-81 Calculator

Angles may be measured in three angles:degree, radian and gradians (grads).

tan(45 deg)=1

tan(45 radians)=1.61977

If your problems require angles to be measured in degrees, make sure that the calculator's angle unit is set to degrees.

In RUN screen press [SHIFT][MENU] (SetUp) select the angle line and press function key under the tab Deg (should be F1).

tan(45 deg)=1

tan(45 radians)=1.61977

If your problems require angles to be measured in degrees, make sure that the calculator's angle unit is set to degrees.

In RUN screen press [SHIFT][MENU] (SetUp) select the angle line and press function key under the tab Deg (should be F1).

Sep 17, 2013 | Casio FX-9860G Graphic Calculator

Here is some help

180deg is equivalent to Pi radians

Take some angle. Its measure in degrees is say x_deg, Its measure expressed in radians is x_rad.

The fraction of 180 deg that the angle represents is equal to the fraction of PI that this angle represents.

Conclusion: the ratio x_deg/ 180 deg must be equal to the ratio of x_rad/PI

x_deg/180 deg=x_rad/PI

Isolate X-rad in the above equation. Some will tell you to cross multiply.

x_rad=(Pi/180)*x_deg

Application: x_deg=-525 in radians?

x_rad= (PI/180)*(-525)=-(525/180)*PI

Keep the value (525/180) as a fraction reduced to its simplest form. The result is 35/12

180deg is equivalent to Pi radians

Take some angle. Its measure in degrees is say x_deg, Its measure expressed in radians is x_rad.

The fraction of 180 deg that the angle represents is equal to the fraction of PI that this angle represents.

Conclusion: the ratio x_deg/ 180 deg must be equal to the ratio of x_rad/PI

x_deg/180 deg=x_rad/PI

Isolate X-rad in the above equation. Some will tell you to cross multiply.

x_rad=(Pi/180)*x_deg

Application: x_deg=-525 in radians?

x_rad= (PI/180)*(-525)=-(525/180)*PI

Keep the value (525/180) as a fraction reduced to its simplest form. The result is 35/12

Sep 26, 2011 | Casio FX-115ES Scientific Calculator

You can not do it unless you know the measure of the central angle sustending (supporting) the arc. If the angle is known, you use the proportionality relation that follows:

If angle is in degrees

(length of arc) / circumference=(measure of central angle sustending arc)/360.

Here the circumference is 2*PI*radius.

If angle is in radians , the relation is somewhat simpler,

**arc length= (radius length)* (angle measure in radians)**

It is clear that in the last relation, the unit for the arc length is the same as the unit for the radius.

If angle is in degrees

(length of arc) / circumference=(measure of central angle sustending arc)/360.

Here the circumference is 2*PI*radius.

If angle is in radians , the relation is somewhat simpler,

It is clear that in the last relation, the unit for the arc length is the same as the unit for the radius.

Jul 15, 2011 | Casio FX-300MS Calculator

I'm going to use sin(90°) as an example. You would hit the sin button, type in 90, then hit ). You must type in the close parenthesis or the calculator won't read it correctly. The answer should be 1.

Jun 08, 2011 | Texas Instruments TI-30XA Calculator

TWO THINGS YOU NEED TO KNOW, Eli.1. Secant will NEVER return a degree measure (or even a radian measure) no matter what computer or calculator you use. The reason is because secant returns the ratio of sides (hypotenuse over adjacent), which has a range of and find its reciprocal (ie, flip the number upside down: the reciprocal of 5 is one-fifth). That's all.B. TI-84 only uses the three basic trig functions. Secant is the reciprocal of cosine. Therefore, in order to find the secant of -1.2 radians you need to be in Radian mode (see #2 above). From there, you just find the cosine of -1.2 and take that values reciprocal (ie, flip the number upside down: the reciprocal of 10 is point one) . That's all. Math lesson: 1 Radian = 180 Degrees. Therefore, 1.2 Radians is roughly one-third of pi, therefore it is roughly one-third of 180 degrees; therefore -1.2 radians would be nearly -60 degrees (a very friendly angle measure). I hope that helps If not, you should call Texas Instruments because they've got friendly people who are happy to assist anyone. Questions like this are right up their ally, advanced questions like the syntax of the poisson cumulative distribution function are not. So, you're fine. For in depth math help holler at www.THEMATHCHEETAH.comIn Short: Secant returns ratios and NOT degrees or radians. Secant is the reciprocal to cosine. Arcsecant WILL return degrees/radians. Your calculator can be set to either mode.TEXAS INSTRUMENTS >>>>> all calculators ever made.

Mar 08, 2011 | Texas Instruments TI-84 Plus Calculator

The trigonometric function [SIN],[COS] and [TAN] have inverse functions arc-sine, arc-cosine, and arc-tangent which are also implemented on scientific calculators. To access the inverse trigonometric functions you use the sequences [SHIFT][SIN], [SHIFT][COS] and [SHIFT][TAN]. The functions are marked on the body of the calculator as [SIN^-1], [COS^-1] and [TAN^-1].

When you use these functions, make sure that the angle unit is correctly set (as required by the problem you are solving) because the angle values returned are in the same unit as the one set.

When you use these functions, make sure that the angle unit is correctly set (as required by the problem you are solving) because the angle values returned are in the same unit as the one set.

Jan 15, 2011 | Casio FX-115ES Scientific Calculator

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