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20 February, 20:26

Find the exact value of cos a, given that sin a = 8/11 and

a is in quadrant I.

cos a=?

(Simplify your answer. Type an exact answer, using radicals as needed.)

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Answers (1)
  1. 21 February, 00:18
    0
    cos (a) = (√57) / 11

    Step-by-step explanation:

    cos (a) = √ (1 - sin (a) ²) = √ (1 - (8/11) ²) = √ (57/121)

    cos (a) = (√57) / 11
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