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28 May, 18:50

Cos theta - 2sin theta cos theta = 0

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  1. 28 May, 18:57
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    Cos (Ф) - 2sin (Ф). cos (Ф) = 0

    Factorize--> cos (Ф) [ 1-2sin (Ф) ] = 0

    a) cos (Ф) = 0 = = > Ф = 0 or (0+2kπ)

    b) 1-2sin (Ф) = 0 = = > - 2sin (Ф) = - 1 = = > sin (Ф) = 1/2 Or

    sin (Ф) = 1/2 = = > Ф = π/3 OR π/3 + (k+1) π/3
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