$\cos^2a\left(\sec^2-1\right)$
$\sqrt[3]{x^2\sqrt[12]{x\sqrt{x^3}}}$
$xdx\:+y^{-1}dy$
$4\sin\left(y\right)^2+2\sin\left(y\right)\cos\left(y\right)$
$\left(1+\cos\left(x\right)\right)^2+\left(1-\cos\left(x\right)\right)^2+2\sin^2\left(x\right)$
$8z^{12}-1$
$\frac{x^3+3x^2+9}{x-3}$
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