$w\left(2x^2y\right)\:x\left(3t^2\right)\:y\left(cos^2t\right)$

$\frac{d}{dx}\left(\sin\left(\frac{x^2+1}{x}\right)\right)$

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

$\lim_{x\to0}\left(\frac{8xy\cos\left(x\right)}{x^2+y^2}\right)$

$\int_{1.8}^{2.4}\:x\:e\:^{-x}dx$

$\frac{d^2y}{dx^2}\left(\frac{5x^4}{4}-3x\right)$

$\left(7x-3y^3\right)^3$