How do you solve: (1+sinx)(1+sin(-x)) ?

1 Answer
Apr 28, 2018

Please see below.

Explanation:

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If you meant how do you simplify this:

(1+sinx)(1+sin(-x))=(1+sinx)(1-sinx)=1-sin^2x=cos^2x

If you meant to solve for x by setting it equal to 0:

Within one period of 0 < x < 2pi

cos^2x=0, :. cosx=0, :. x=pi/2, (3pi)/2