$3-\left(-4\right)+\left(-2\right)-6$
$\cos\left(x\right)\cdot\cos\left(2x\right)+2\cdot\cos\left(x\right)^2=0$
$2x^2-x-3=0$
$\int\frac{8x^2}{\left(64-x^2\right)^2}dx$
$\int\:tan^2\left(3x-1\right)dx$
$\left(7x^{3}y^{2}\right)\left(4xy\right)\left(-2y\right)$
$\int\left(8+e^{-t}\right)^2e^{-t}dt$
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