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26 February, 22:31

Which expression is equivalent to

(sin x + 1) (sin x - 1) ?

A.) cos^2x

B.) - cos^2x

C.) cos^2x + 1

D.) cos^2x - 1

E.) - cos^2x + 1

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Answers (2)
  1. 26 February, 23:56
    0
    B.

    sin^2x + cos^2x = 1

    hence Sin^2x-1 = - cos^2x
  2. 27 February, 01:48
    0
    Sin^2x - 1 = - cos^2x ...
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