$x^2y+2x^2y-3xy$
$\cos\left(a\right)\left(\tan\left(a\right)+1\right)+\cos\left(a\right)$
$5x^2+3=2y^2+5$
$4x^2+4xa^3+a^6$
$\frac{dy}{dx}=\left(1+x^2\right)^4$
$x^2-4b^2$
$-9x^3+4x-x^2+4x^3+11x^2+5x^3+x$
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