$\frac{d^2}{dx^2}\left(xy+7e^y=7e\right)$
$3\left(-1\right)^2$
$\frac{3x-6}{5x^2-13x+6}$
$5-3\left(-7r+1\right)>-5r-3+9r$
$\int4cos^7y\:sen^3y\:dy$
$\left(-5v^{3}-9v^{2}+6v\right)-\left(-5v^{3}+9v^{2}-6t\right)$
$\cos x\cdot\sec x-\frac{\cos x}{\sec x}=\sin^2x$
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