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#