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• Casio Master

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.

Posted on Sep 11, 2010

• k24674 Oct 01, 2010

Sorry. The sentence
"To get results in radians you must configure the angle unit to be degree." does not make sense.
"To get results in radians you must configure the angle unit to be radian."

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Hi,
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Posted on Jan 02, 2017

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### The math problem is x2= 85-84 cos25 and it doesn't work on the fx-260

85-84cos(25 deg)=8.87015 and I do not see how you get 3. If angle is in radians the answer is 1.73896. Make sure your calculator is configured to use the right angle unit (radian, degree or gradian).

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The sine of 0.5 degrees is about 0.00872, which your calculator may be displaying as something line 8.72 times ten to the negative 3. Look to the far right end of the number: do you see "x10-3" with the "-3" superscripted? In that case, again your calculator is giving you the correct answer.

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When you are handling trigonometric functions and their inverses, the results depend on the angle unit your calculator is configured for.
When angle is in degrees, tan (1/2)=8.726867791x10^(-3)

It seems that your angle unit on calculator is set to degrees, while it should be set to radians.

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### I am a casio fx-82MS user. i would like to know how i can convert polar form to rectangular form in my calculator

Hello,
Press [MODE] and select [1:COMP]
Press [SHIFT][MODE] and select [3:Deg]. You can also use rad if the angle you are given is in radians.
To start the conversion
Press [SHIFT][-] (Rec) screen displays Rec(
Key in the radius r , ex: 3 screen displays Rec(3
Press [SHIFT][)] (,) to enter comma separator Rec(3,
Key in the angle in degrees, ex: 57.3; screen displays Rec(3,57.3
Press ) to close parentheses; screen displays Rec(3, 57.3)
Press [=]
Screen displays
Rec(3, 57.3)
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Y=2.524532346

X and Y are the values of the coordinates.

Rec(3, Pi) gives X=-3, Y=0

I just realized that your question pertains to the FX82MS but is listed under the FX115ES (That is quite a difference) So my answer above does not concern you but I will leave it as is should anyone need the answer for the FX115ES.

Look at the enclosed screen capture for the FX82MS

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### Casio fx-300es---how to convert radians to degrees

Hello,
You use the key combination [SHIFT][ANS] (DRG>).

If the default angle unit is degree
Type in the angle value in radian, say 1.2.
Press [SHIFT][ANS] (DRG>).
The screen displays 1: deg symbol, 2: a raised r for radian, and 3; a raised g (for grad).

1.2 [SHIFT][ANS] (DRG>) [2: raised r] .
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Dec 02, 2009 | Casio fx-300ES Calculator

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

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Angle mode, Degree/radian setting, Chapter 2, pg 53 (pg70 of 623) Tan instructions pg 510 (appendix A pg 527 of 623) Here's your manual, download this file: http://www.ti-89.org/uploads/ti-89-manual.pdf

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