$4-2x-x-17+6$
$1+\frac{\cos\left(2x\right)}{\sin\left(2x\right)}$
$\sin\left(t\right)\cos\left(v\right)=\frac{1}{2}\left(\sin\left(t+v\right)+\sin\:\left(t-v\right)\right)$
$tan\left(arccos\left(-0.6\right)\right)$
$-8x-3=-75$
$\frac{24x^3+10x^2-62x+15}{4x-5}$
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