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20 July, 09:22

Which expression is equivalent to sin^2 x-sin x - 2/sin x - 2

A. sin x + 1

B. sin x - 1

C. sin2x

D. - sin2x

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Answers (1)
  1. 20 July, 09:26
    0
    Set sin x to a variable, i. e. u

    u^2-u-2/u-2.

    Factor:

    (u-2) (u+1) / (u-2)

    Simplify by canceling the u-2s ...

    leaving u+1. Since we substituted u for sin x ...

    the answer is A. sin x + 1
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