$sin\left(\frac{165}{2}\right).sin\left(\frac{75}{2}\right)$
$\frac{\cos\left(x\right)}{\sin^2\left(x\right)}-\cos\left(x\right)\cot^2\left(x\right)=\cos\left(x\right)$
$\int\:sin\left(\frac{x}{2}\right)dx$
$\int\cos\left(\frac{y}{z}\right)dy$
$2\sin\left(x\right)\cos\left(x\right)-2\cos^2\left(x\right)+1$
$9y+5m+8ym-15y$
$\int\left(\frac{8}{3x-5}\right)dx$
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