$-4a^2+3a^2$
$\left(x^3\:-\:5y^4\right)\:\left(x^3\:+\:5y^4\right)$
$\int\left(x^3+x+2\right)e^xdx$
$\lim_{x\to\frac{1}{2}}\left(\frac{2x-1}{\sqrt{x}-\sqrt{1-x}}\right)$
$\int sin\left(x\right)\cdot\cos\left(kx\right)dx$
$xy'+2x^2y-4x^2=0$
$cx=x^2+8x+16$
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