$-2x^2-6x+13$
$\frac{dy}{dx}\left(\sqrt{2x-1}\right)$
$x+3y=11$
$\frac{dx}{dt}=\frac{\left(1+x^2\right)\pi t}{12\sqrt{1-t^2}}$
$\sec\left(x\right)-\sec\left(x\right)\cdot\left(sinx\right)^2$
$\int\sqrt{1-4z^2}dx$
$4xy+2y^2+2x^2+2x+2y-2\left(x+y\right)^2$
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