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     EduGorilla 
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    If 2 cos (A/2) = , then

    Options :-

    1. nπ + (π/4) < A/2 < nπ + (3π/4)
    2. nπ - (π/4) < A/2 < 2nπ - (3π/4)
    3. 2nπ - (3π/4) < A/2 < 2nπ + (5π/4)
    4. 2nπ + (π/4) < A/2 < 2nπ + (3π/4)
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