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24 November, 07:38

Simplify the expression:

cos^2 (pi-x) / sqrt1-sin^2 (x)

A. Tan (x)

B. Cos (x) tan (x)

C. Cos (x) cot (x)

D. Sin (x) tan (x)

+3
Answers (2)
  1. 24 November, 08:45
    0
    Formula

    cos (pi - x) = - cos (x)

    cos^2 (x) + sin^2 (x) = 1

    i think you mean this

    cos^2 (pi-x) / sqrt[ 1-sin^2 (x) ]

    = cos^2 (x) / sqrt[ cos^2 (x) ]

    = cos^2 (x) / | cos (x) |

    = | cos (x) |

    if so, none is correct
  2. 24 November, 10:32
    0
    -[ cos2 (x) √ - (sin (x) + 1) (sin (x) - 1) ] / [ (sin (x) + 1) (sin (x) - 1) ] I belive is the answer
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