$y^5\frac{dy}{dx}=x^3y^6+x^3$

$\left(\sin\left(x\right)+\sec\left(x\right)\right)\left(\sin\left(x\right)-\sec\left(x\right)\right)$

$-15ab\left(-4a^3\right)$

$3\cos\left(2x-40\right)-1=0$

$-13\:+\:+7\:-\:-10\:-\:-99\:-\:-1$

$\frac{dy}{dx}=\:30x-xy$

$\lim_{x\to0}\left(\frac{cos\left(x^2\right)}{1}\right)$