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How do you calculate cos squared? - Texas Instruments TI-83 Plus Calculator

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  • Anonymous Apr 23, 2009

    How do you calculate cos squared?

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(cos(x))^2

Posted on Feb 18, 2009

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How do i graph a circle in parametric mode?


The simplest way is
X1=cos(T)
Y1=sin(T)
Set angle unit to radians,
Set the Zoom window to SQR (square), otherwise your circle will look like an ellipse.

f2d9b8a0-36c9-4af2-81cb-3c0633a2ed0f.png

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Cos theta 50


To calculate the Cosine of an angle, you first make sure that the angle unit on your calculator is set to the correct one (degree, or radian). After that it is all simple. Enter the angle value (50 degrees) then press the [COS] key. If you get an error then press the COS key followed by the angle value then press =.
Note if your calculator display Cos ( , with a left parenthesis, then you have to press COS first followed by the angle value and possibly the right parenthesis.
Note. The theta here is of no relevance.

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How do I cos square something im not getting the correct answer doing this.


Take the cosine of the number (cos key), square the result (x2 key). Make sure the calculator is in DEG and not RAD mode. Most elementary trig is conducted in degrees, not radians.

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1 Answer

How do i convert the answer of cos(30) which comes out to 0.8660254038 to a fraction?


I am sorry, my friend, but you are asking the impossible. The reason is that the exact value of cos(30 deg) is equal to square root (3) /2 which cannot be fraction (the square root of 3 is an irrational number).
However, it may be possible for your calculator to give you a result with a radical (3)/ 2 but that is no fraction. (A fraction must have both numerator and denominator as integers).

To get a radical result set the IO mode to MathIO.
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How to solve for the trigonometric functions in the casio scientific calculator?


Press the relevant function key [SIN],[COS],[TAN] followed by the angle value.
For inverse trigonometric functions [SIN^-1], COS^-1], or [TAN^-1], Press [SHIFT][SIN], [SHIFT][COS], or [SHIFT][TAN].
For other functions
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csc(x)=1/sin(x)
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When calculating trigonometric functions one must make sure that the angle unit the calculator is using is the correct one.

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2 Answers

Find cos 32° 45'


Hello,
Look at the column of keys under the ALPHA key. You have the integral, the square root, and then the key that has a degree sign, an apostrophe and a double closing quotation mark. That is the one you use to enter the angle in sexagesimal notation. To simplify my task I will symbolize the key with [DMS], degree, minute , second.
To calculate cos (32° 45')
you press
[COS] 32[DMS]45 [DMS] ) and press [=] The result si 0.841039013
Hope it helps.

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1 Answer

Cos^2


cos(number)^2


(or use the square button)

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if you want to square sin(3), press:

(
sin
3
)
)
^
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TI-89 Problems


There isn't anything "wrong" with it.

Go to mode, and set the results of your inquiries from Exact to approx.

If you put in cos(e^2), it will print out cos(e^2) because it's the most exact it can be without going into a decimal. (cos(e^2) will be a transcendental number like Pi).

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