$x^2+1\frac{dy}{dx}=x^2+2x-1-4xy$

$\int cos^2\left(\frac{x}{4}\right)dx$

$\lim_{x\to0}\left(1-\cos\left(x\right)c\tan\left(x\right)\right)$

$-6\left(3x^2+6\right)$

$3w\frac{-3}{5}-\left(3w\right)\frac{-3}{5}$

$\frac{dy}{dx}=\frac{x^3-2x}{x}$

$\int\left(2\cos\left(2x-3\right)\right)dx$