$\cot\left(x\right)\left(1-\cos\left(2x\right)\right)$
$\frac{x^4-8x-15}{x^4-9}$
$-cos2x=\frac{1}{2}$
$12abc-5-12abc+8$
$6\cdot8-10$
$-35\cdot10$
$\csc^2x-4\cot x-2$
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