$\sin^2x\cot x\cos x=\sin x$

$-2\:x\:\frac{4}{5}$

$100x^4-220x^2y+12y^2$

$\frac{d}{dx}\left(y\:=\left(x+3\right)^{\left(5x-3\right)}\right)$

$\left(\sin\left(2x\right)\cot\left(4x\right)\right)$

$\frac{d}{dx}\left(\frac{2\left(1+e^x\right)^4.\sqrt{x^2-2x^3}}{sin^2x}\right)$