$\int\left(-5x+1\right)\cdot e^{-2x}dx$
$18.0007+0.300287\ln\left(19\right)$
$8x+12=5x\:+3$
$\frac{\sin^2\left(2x\right)}{1-\sin^2\left(x\right)}$
$\frac{1-16z^2}{1+4z}$
$sec^2x\left(tan^4x+2tan^2x+1\right)$
$-1\cdot16$
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