$x^2y\frac{dy}{dx}=e^x$
$\int2xn^{4x}\sin\left(5x\right)dx$
$\left(3z^2-4\right)^2$
$\frac{dx}{dy}=2x+\left(e^y\right)^2$
$\cot\left(x\right)+\csc^2\left(x\right)$
$a^2-4a-21=0$
$\frac{1}{1-sec\:x}+\frac{1}{1+sec\:x}$
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