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6 April, 00:05

Find cos x if

SIN^2 x-1/COS x = - 1

a. - 1

b. 2

c. 1

d. 0

+2
Answers (1)
  1. 6 April, 01:44
    0
    Step-by-step explanation:

    sin²x-1/cosx = - 1

    cosx = - (sin²x-1)

    cosx=1-sin²x

    cosx=cos²x

    cosx=1

    so option C is the correct answer
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