$2\pi\cdot20$

$0.56+-2.9$

$\left(3y\right)\left(-2y\right)$

$5x^4-3x^2+2x^2+6x$

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

$\cos2\left(x\right)=2\sin\left(x\right)\cos\left(x\right)$

$\int6\sin^{3}\left(x\right)\cos\left(x\right)dx$