Question about Texas Instruments TI-89 Calculator

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Radians and degrees flipped

When I put my calculator in degrees, it gives me radians measures, and when I put it in radians, it gives me degrees measures. Help please!

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Reset ur calculator. press 2nd 6 F1 3 Enter. Note that all your data will be gone

Posted on Jul 09, 2008

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My calculator is not computing sin^-1 or cos^-1 correctly, I put sin^-1(0.184) in and it came out with 10.60283... when I should be getting 1.39. HALP?


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

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Mar 25, 2014 | Casio FX-115ES Scientific Calculator

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My scientific calculator gives me wrong trigonometric values


That is the correct value for the cosine of 60 radians.

If you want the calculator to use some other measure for angles, press the MODE key repeatedly until you get to the "Deg Rad Gra" screen, then press the digit corresponding to your choice (degrees, radians, or grads). See "Configuring the Calculator Setup" in the second column of the first page of the manual: http://www.fixya.com/support/p1400062-casio_fx82ms_scientific_calculator/usermanual-BA0F781-pdf

Dec 16, 2013 | Casio FX82MS Scientific Calculator

1 Answer

What does DEG on screen of TI-30Xa mean


It means your calculator is set to degrees mode. Angles can be measured using three different units: degrees (360 degrees in a circle), radians (2pi radians in a circle), or grads (400 grads in a circle).

Pressing the DRG key cycles through the three modes. No matter which mode you select, one of the annunciators will appear on the screen to indicate the current mode.

Dec 07, 2013 | Texas Instruments TI-30XA Calculator

1 Answer

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

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

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Whenever i put in sin or cos or tan on my calculator the wrong answer comes up, how do i fix this?


Most likely you do have the calculator in radians (or if you are working in radians, you have it in degrees). Press the mode button, move cruser down to "radians degrees" highlight degrees. and press "2nd quit". things sould be better!

Jun 03, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Converting degrees and minutes and seconds to radians


Hello,
With the TI8x/TI8xPlus you can enter an angle in degrees (Angle mode must be set to degrees) and convert it into DMS representation the following way. Exemple
18.675 [2nd][ANGLE][4] [ENTER] gives 18deg 40' 30''
If Angle [MODE] is set to degrees you can enter a number in radians and convert it into degrees. Exemple How many degrees are ther in 1rad ?
[1][2nd][ANGLE][3] display 1 with a small r as superscrit. Pressing [ENTER] yields 57.29577951

To convert 1rad into DMS, takes a little effort but can be done: you have
to convert radians to degrees and the result [ANS] into DMS.

You cannot use an angle written in DMS in any calculation.
But if you want to convert an angle from degrees to radians enter your number and divide by 57.29577951

Hope it helps

Sep 02, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

On my TI 83 plus my sine cosine and tangent buttons are giving incorrect answers.


Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert, 360[degrees] = 2* pi [radians]
(easy to remember, 360deg in a circle, 2pi radians in a circle)
Good luck

Aug 11, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Using Tan,sin, cosin


Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert 360[degrees] = 2* pi [radians]
(easy to remember, 360deg in a circle, 2pi radians in a circle)
Good luck

Aug 11, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Now I can only count in Degrees and radians


Press the MODE button to enter the Mode menu, and change the angular measure to suit.

Mar 25, 2009 | Texas Instruments TI-83 Plus Calculator

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