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12 September, 15:54

Cos^2 2A+4sin^2A*cos^2 A=1

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  1. 12 September, 16:53
    0
    Using Sin^2 and Cos^2 identities,

    = Cos^2 (2A) + 4[ (1/2) (1-Cos (2A) ][ (1/2) (1+Cos (2A) ] = 1

    = Cos^2 (2A) + 1 - Cos^2 (2A) = 1

    0 = 0

    There is nothing to solve for as it is an identity of sorts.
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