$\int\frac{x}{\sqrt{9x^2-1}}dx$
$\lim_{x\to1}\left(\frac{4\sin\left(\pi x\right)}{\cos\left(\pi x\right)+x}\right)$
$\frac{x-x^2}{1+bx^2}$
$\int4^{4x^2}xdx$
$\sqrt{15y^3}$
$2\:\csc^2y\:+\:11\:csc\:u\:+\:15\:=\:0\:$
$a^6-9$
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