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    Question

    If tan ╬╕ = (2/тИЪ5), then determine the value of

    cos2┬а╬╕
    A 3/5 Correct Answer Incorrect Answer
    B 5/9 Correct Answer Incorrect Answer
    C 9/16 Correct Answer Incorrect Answer
    D 5/8 Correct Answer Incorrect Answer

    Solution

    Since, sec2┬а╬╕ - tan2┬а╬╕ = 1 Therefore, sec2┬а╬╕ = 1 + (2/тИЪ5)2┬а= {(5 + 4)/5} = (9/5) Therefore, cos2┬а╬╕ = (1/sec2┬а╬╕) = (5/9)

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