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(cos(pi-x)cos(-x))/(sin(pi-x)cos(pi/2+x)...

`(cos(pi-x)cos(-x))/(sin(pi-x)cos(pi/2+x))=cot^(2)x`

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To prove the equation \[ \frac{\cos(\pi - x) \cos(-x)}{\sin(\pi - x) \cos\left(\frac{\pi}{2} + x\right)} = \cot^2 x, \] we will simplify the left-hand side step by step. ...
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