$x\cos^2\left(y\right)dx=\tan\left(y\right)dy$

$\frac{\cos\left(8x\right)\cos\left(2x\right)}{2}$

$\int x^4\left(3x^5-2\right)^7dx$

$130x+20y=385$

$\frac{d}{dx}\left(x^2cos2^x\right)$

$\frac{-3+\left(-3\right)}{-2}$

$\int\frac{\left(x^2\right)}{\left(\left(x-1\right)^2+1\right)^2}dx$