Question

    Find the value of [cos25°−sin65°]/

    [cos25°+sin65°].
    A 2 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

     [cos25°−sin65°]/ [cos25°+sin65°].  Use the identity sin 65° = cos (90° - 65°) Since sin 65°= cos 25°, the expression becomes- [cos 25° - cos 25°]/ [cos 25° + cos 25°]  = 0/2cos25° =0 So, the value of the expression is 0.

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