$20+90+519$

$\frac{d}{dx}\left(y+xy^3=0\right)$

$2\sec^2\left(x\right)-1=\frac{1+\sin^2\left(x\right)}{\cos^2\left(x\right)}$

$2a+3b-6c+3a-11b-3c-3b-5a+5$

$3\cdot\left(8+\left(-2\right)\right)$

$\arctan\left(\frac{\infty\:}{3}\right)-\left(\arctan\left(\frac{\sqrt{3}}{3}\right)\right)$

$\frac{9x^2}{4}+30xy+125y^2$