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

$14c^2d^2-28c^3+56c^4$

$\int\left(x^2\left(\sqrt{9-x^2}\right)\right)dx$

$4^{-3}\cdot5^2$

$\int_0^{33}\left(\frac{1}{\sqrt[5]{x-1}}\right)dx$

$\frac{dy}{dx}=\sin x-y$

$\lim_{x\to2}\left(\frac{1}{\left(x-2\right)^2}\right)$