$\frac{h}{\sqrt{x+h}}$

$\frac{x^3-y^{12}}{3x^2+y^4}$

$8h+2h^2-3h+4h^2$

$\int7x^3sec^2\left(5x^4-3\right)dx$

$\lim_{x\to0}\left(\frac{1-\cos\left(2\right)}{3x}\right)^{6x}$

$\int\left(\frac{\cos\left(6x\right)}{4+\sin\left(6x\right)}\right)dx$

$\frac{\sin^2a-8cos^2a}{1-9\cos^2a}$