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16 September, 00:35

Show that sin (x+pi) = - sinx show all your work

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  1. 16 September, 02:45
    0
    By compound angle formula,

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

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

    =-sin (x)
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