$\cos\left(x\right)\left(\sin\left(x\right)^2-\cos\left(x\right)^2\right)\sec\left(x\right)-\cos\left(x\right)^2$
$6x^2+4xy^2$
$\left(a^m-4b^n\right)\left(a^m+4b^n\right)$
$\frac{x}{-8}=-4$
$\left(x-2\right)^2\:\le\:\:16$
$\left(7x+5\right)\left(4x^2+8x+5\right)$
$x\frac{dy}{dx}+4y=\frac{5x^2}{4y}$
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