$10d\:+\:2d\:$

$\lim_{x\to0}\left(\frac{7-sin\left(2x\right)}{9x}\right)$

$\int\left(4xe^{18x}\right)dx$

$\frac{d^{15}}{dx^{15}}\left(x^2\cdot\cos\left(x\right)\right)$

$\frac{dy}{dx}=\frac{x^2\left(y+1\right)}{y^2\left(x+1\right)}$

$\frac{dy}{dx}\left(y\:=\:x^2\sqrt{x-9}\right)$

$8cos\:b+\sqrt{52}=0$