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    5. Find the value of sin² 25 + sin² 65.

    Question

    Find the value of sin² 25 + sin²

    65.
    A –1 Correct Answer Incorrect Answer
    B 1/2 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    sin² 25 + sin² 65.                  sin² 25 + sin² (90-25)             ∴  sin 2(90-25) =cos 225 sin² 25 + cos2 25. =1.

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    Relevant for Exams:

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