$y=\ln\left(\sqrt{1-x^2}\right)+x\tanh\left(x\right)$
$\int\left(4e^{-7x}\right)dx$
$2^{-3t^3+5t}$
$\frac{d}{dx}\frac{2-2xy^2}{2x^2y}$
$878\cdot2$
$\left(4+\:7a^2\right)^2$
$-\left(-5\right)-11+13-8+\left(-6\right)$
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