$4\sin^2\left(x\right)\cos^2\left(x\right)=4\cos^2\left(x\right)$
$\frac{d}{dx}\left(x^2\left(1-7x\right)\right)$
$\int\left(x^2+3x-1\right)\sqrt{2x-1}dx$
$9y+3-4x-2y-3x-591$
$\:x^4\:-x^2\:-12$
$\int7x^2\sin5xdx$
$\left(6a^4-b^5\right)^3$
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