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1 December, 00:52

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

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  1. 1 December, 01:13
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    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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