$\tan^2x+\sin^2x+\cos^2x=\sec2x$
$\frac{d^2}{dx^2}\:\:\frac{-2}{5x+2}$
$3\left(4k+20k^2+25k^3\right)$
$x^9+8x^{12}$
$x^{-6}\cdot\:x^3\cdot x^5$
$3 n + 2 ( - 2 n - 1 )$
$48x^2y^4-12x^3y^2+6x^2y^2$
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