Question

1 - sin x - cos x
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Answer 1

Răspuns:

$1-sin x- cosx= cos0-cosx-sinx <=> -2sin\frac{0+x}{2}*sin\frac{0-x}{2}-sinx$

$= -2sin\frac{x}{2}*sin\frac{-x}{2} -sin(2*\frac{x}{2}) <=> -2sin\frac{x}{2}*sin\frac{-x}{2}-2sin \frac{x}{2} *cos \frac{x}{2}$

$=> -2sin\frac{x}{2}(sin\frac{-x}{2} +cos\frac{x}{2})$

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