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29 April, 21:04

By using sum or difference formulas, cos (π-x) can be written as

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  1. 29 April, 21:34
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    We have cos (x - y) = cosxcoy + sinxsiny cos (π - x) = cosπcosx + sinπsinx cos (π - x) = (-1) cosx + 0sinx = - cosx;
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