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    Question

    If sin╬╕ = 3/5 and ╬╕ is an acute angle, find cos

    ╬╕.
    A 4/5 Correct Answer Incorrect Answer
    B 5/4 Correct Answer Incorrect Answer
    C 3/4 Correct Answer Incorrect Answer
    D 7/9 Correct Answer Incorrect Answer

    Solution

    ATQ, sin┬▓╬╕ + cos┬▓╬╕ = 1┬а (3/5)┬▓ + cos┬▓╬╕ = 1┬а 9/25 + cos┬▓╬╕ = 1┬а cos┬▓╬╕ = 16/25┬а cos╬╕ = 4/5┬а┬а

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