Hi,

sin x(sin x + 1) = 0 

sin^2 x + sinx = 0

sin^2x = - sinx

sinx = -1

....

4 cos^2 x - 1 = 0

cos^2 x = 1/4

cosx  = ± 1/2

....

refer to (cosx, sinx) Summary Unit Circle for corresponding x-values

.

 

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