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6 August, 11:46

Verify the identity of

sin (x+pi/2) = cos x

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  1. 6 August, 12:16
    0
    Sin (A+B) = sinAcosB + sinBcosA

    sin (x + pi/2) = sin x cos pi/2 + sin pi/2 cos x

    = sin x (0) + 1 (cos x)

    = cos x

    (cos pi/2 = 0 and sin pi/2 = 1)
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