Question about Casio FX83ES Scientific Calculator

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How can i use the caluclator,, so when it is in radian mode and i am using pi it come up as exact values.. eg 2/3pi and not like 2.09439...

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Set the IO Mode to MathIO.
Press SHIFT MODE to open SetUp.
Select 1:MathIO

Posted on May 25, 2011

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Convert -525 degrees into radain pi form


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


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

1 Answer

When i put in integrals to solve, the ti89 gives me an answer with pi / a degree(normally 180) i do not need pi anywhere in my answer. how do i change this?


You are not using the right units. The integrals of functions involving angles (trigonometric functions) that you find in tables and other refrerences are valid only for the natural angle unit which is the radian. With any other angle unit (degree, gradian) there is a scale factor to take into account. That is the factor yoy are complaining about.

If it were not the case, the same integral will have two different values depending on the unit you use: and that cannot be.

If you want the calculator to give you the standard integrals in reference tables you must set the default angle unit to be radian.

Let x_deg be an angle in degrees and x_rad the corresponding value in radians.
180 deg=Pi rad
x_deg/180=x_rad/Pi
x_deg =(180 deg/PI)*x_rad
calculating the differentials of bot sides you obtain
dx_deg= (180/Pi) dx_rad

Similarly, with grads
dx_gr=(200/Pi)*dx_rad

Sep 20, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I have to take the secant of -1.2. I'm supposed to get a degree. I can't figure out the order to push buttons. PLEASE help!


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

1 Answer

Ti 84 mode a+bi you can not add 5 at 90 degrees to 5 at -90 degrees. You need to switch to exponential mode e^ and enter as 5 e^(pi/2i) this is ok for 180 degrees. however what do you do when...


You can add angle measures by hitting 2nd angle and choosing the degree option. Put this after a value (e.g. 90(degrees symbol)) and add you can add angles that way. Be sure that you are in degree mode when doing this (you can use the radian symbol for adding radians too). Still, this is a very tedious process and I recommend just adding angles as regular values (e.g. 90 + 200 = 290) and correcting for degrees manually.

Feb 21, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Solve the following equation for the indicated value of x: y = 4 sin x; for x = pie


Since X = pi, (3.141592...) I'm going to assume the problem is in radians not degrees.
Substitute pi in for X in the first equation and you get y = 4 sin(pi)
The sin of pi radians is zero.
Therefore, y = 4 * 0 = 0

I hope this helps you out.

Dec 15, 2010 | SoftMath Algebrator - Algebra Homework...

1 Answer

I need to be able to display my answers as radians, e.g ?/3. Please help


To get results in radians you must configure the angle unit to be degree.
  1. In Run screen press [SHIFT][MENU] to access (SETUP).
  2. Use Down arrow to highlight the line Angle :
  3. Press F2 key to select the TAB Radian.
  4. Once you do that all values (input of trigonometric functions and polar graph functions OR output of inverse trigonometric functions) are in radians.
However I believe I sense a misconception in your request. You can press [SHIFT][x10^X] to enter PI, but the calculator will never give you an angle result as a fraction of PI. You will have the numerical approximation of it that corresponds to the number of decimal digits you are keeping.

Sep 09, 2010 | Casio FX-9750GPlus Calculator

1 Answer

DEG mode


The DEG indicator has absolutely nothing to do with division, fraction or other operations. It is relevant only when you are calculating trigonometric functions (Sine, Cosine Tangent and their inverse functions.)

When you are calculating trigonometric functions the results depend on the angle unit the calculator is configured for
DEG >> angle values are in degrees.
RAD>> angle value are in radians

From the equivalence 180 deg =Pi radians you get
1 rad= 180deg/Pi=180 deg/3.14..=57.29577951 degrees.

The DEG indicator merely reminds you that angles are in DEG. If you change the unit to RADians the RAD indicator will be displayed instread.

Apr 15, 2010 | Casio FX-260 Calculator

1 Answer

How do I get from degrees to radians? For some reason my TI-84 will not convert degrees to radians.


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Press the [MODE] key to access the mode comfiguration screen .
Set angle unit to to radian (see above)
Enter angle value in Decimal degrees only, use the [2nd][ANGLE] key sequence to have access to the degree symbol. The degree symbol must imperatively appear at the end of the angle value.

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Here are some examples
If you use angle values in DMS, it will not be converted to radians, but to decimal degrees.
If you omit the degree symbol there is no conversion.

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A general formula is Pi radians =180 degrees
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Feb 10, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I am getting the wrong answers with the tan -1 function


Hello,
That habit of TI, Casio, and Sharp to label the inverse trigonometric functions with the -1 superscript can cause confusions.
  1. The inverse trigonometric functions arcosine, arcsine, and arctangent (labeled by manufacturers as cos^-1, sin^-1, and tan^-1) should not be confused with the other trigonometric functions known as secant(x) =1/cos(x), cosecant(x)=1/sin(x) and cotangent(x) = 1/tan(x).
  2. To avoid errors in the use of the inverse trigonometric functions, one must be careful and set the angle unit to the one required by the problem at hand (degrees, or radians)
  3. To make the trigonometric functions really functions, their range is restricted.
  4. In this calculator arcosine (x) gives results between 0 and 180 degrees (if angle MODE is Degree) or between 0 and Pi radians (if angle MODE is Radian).
  5. The range of results for arcsine(x) and arctangent(x) is between -90 degrees and +90 degrees (if angle MODE Degree) or -Pi/2 and Pi/2 (if angle MODE is Radian)
With this information you should be able to set the angle unit correctly ([MODE][Radian] or [MODE][Degree] ) and interpret the results. If you want to extend the angle to other values, use the periodicity of the trigonometric functions.

Hope it helps

Nov 06, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Wrobg answer whenever I use radians


Hello,
To avoid problems,set your angle unit to radians by default. Press [MODE]. If Radian is highlighted (text on black background), it is indeed the default mode. If Degreee is highlighted, scroll dowm to the line and use the left arrow to select Radian and press ENTER. Radian will start blinking.
Any number you feed a function that acts on angles (sin, cos, tan) will be considered in radians. Any result that comes out of the inverse trigonometric functions (arcsin, arccos, arctan) is in radian. The angle coming from a conversion from cartesian coordinates to polar coordinates is in radian.
You have a simple way to convert the value from radians to degrees because 1 rad=180/pi. Store this value in a variable [STO->] D
180/[2nd][PI] [STO->] D

Since the last result is always stored in [Ans] all you have to do is to multiply by D: [Ans][x][ALPHA]D converts results in degrees.

Hope it helps

Sep 14, 2009 | Texas Instruments TI-83 Plus Calculator

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