$2csc\left(2x\right)=sec\left(x\right)csc\left(x\right)$
$\int18x^2\ln\left(x\right)dx$
$\lim_{n\to\infty}\left(\frac{1}{\sqrt{4+n}}\right)$
$\frac{dy}{dx}=2\left(1+y^2\right)+2\left(x+xy^2\right)$
$x^2-14x-1=0$
$\sec\left(35.43\right)\cdot5.6$
$5\frac{dy}{dx}-15xy=3x$
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