$\left(1+tan\:x\right)cos^2\:x=1$
$2\frac{1}{2}\cdot\left[\left(2\frac{1}{2}\right)^3\right]^{\frac{1}{2}}$
$\tan x\sec x=\tan x$
$\left(2y-9\right)dx+xdy\:=\:0$
$\frac{dy}{dx}\left(\frac{x^2+3}{x+4}\right)$
$9xy+8x-8y+6xy$
$\left(a^2+x^2\right)\left(a+x\right)$
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