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13-09-2018
Mathematics

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

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13-09-2018

We have cos( x - y ) = cosxcoy + sinxsiny <=> cos ( π - x ) = cosπcosx + sinπsinx <=> cos ( π - x ) = (-1)cosx + 0sinx = -cosx;

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