$-4+7\cdot4+1$
$-2x^2-6x$
$3y+7+4y+3$
$x+5y\:=15$
$log\:10^{2x}$
$4x^2-4x-16$
$\frac{dy}{dx}=\frac{\cos^2\left(y\right)}{\sin^2\left(x\right)}$
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