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    Question

    If (tan 6a · tan 3a = 1), then find the value of (tan

    9a).
    A √3 Correct Answer Incorrect Answer
    B Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer

    Solution

    If tan x tan y = 1, then (x + y) = 90°
    So, 6a + 3a = 90
    => 9a = 90
    => tan 9a = tan 90 = ∞

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