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GREYUIT [131]
2 years ago
14

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

Mathematics
1 answer:
Liono4ka [1.6K]2 years ago
8 0

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

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