$\frac{d}{dx}\frac{x^2+3y}{x-2}=y^2$
$\int\frac{x^{3}}{\sqrt{x^{2}+1}}dx$
$x^2+18x+56$
$\left(o.4a-5b\right)\left(0.4a+5b\right)$
$\csc^260-\tan^230$
$-5x+6+4y-12+6y-9x$
$x^2+2n+4=\left(n+2\right)^2-2n$
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