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13 September, 18:08

Verify the identity

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

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  1. 13 September, 18:28
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    Hello

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

    = cos (x) * 0-sin (x) * 1

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