$\left(-8x\right)\left(+10y\right)$
$-73=-3x-7\left(-4x-11\right)$
$2x^4-2y^4$
$2x+20=-30$
$\frac{\sec^2\left(3u\right)-1}{\sec^2\left(3u\right)}=\sin^2\left(3u\right)$
$\frac{csc\left(-x\right)}{sec\left(-x\right)}=-cot\:x$
$\int\left(e^{-3x}\cdot\left(4-e^{-3x}\right)^2\right)dx$
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