$\frac{d}{dx}\frac{2x-5}{2y}$
$\int\frac{3x^4+2x^2}{\left(x^2+4\right)^2}dx$
$\frac{1}{4}\int\frac{sec^2z}{\sqrt{\left(1+tan^2z\right)+\frac{1}{4}}}dz$
$\left(x\cdot2\right)\left(x+9\right)$
$\frac{dy}{dx}=2y\tanh\left(x\right)$
$2m^4\cdot4m$
$5x-3y-z=1$
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