$\int_0^{\infty}\left(\frac{9}{36+x^2}\right)dx$
$\left(1+\sin\left(y\right)\right)\left(1+\sin\left(-y\right)\right)$
$\int\frac{x+5}{x^2-9x+20}dx$
$xy'=6y$
$f\left(x\right)=e^{2x+1}$
$\lim_{x\to1}2+\ln\left(a+x\right)$
$-2x\:+\:x\:squared$
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