# Easy question about graphing a cos function

• September 21st 2009, 04:54 PM
mybrohshi5
Easy question about graphing a cos function
How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

• September 21st 2009, 05:08 PM
skeeter
Quote:

Originally Posted by mybrohshi5
How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

if using a TI, the correct syntax is ... $Y_1 = \cos(x)^2$
$\cos^2{x} = \frac{1+\cos(2x)}{2}$