$\frac{\sin^3\left(10\right)+\cos^3\left(20\right)}{\sin\left(10\right)+\cos\left(20\right)}$

$4\pi+\pi$

$\frac{\sin\left(x-y\right)}{\cos\left(x\right)\cdot\cos\left(y\right)}$

$\frac{dy}{dx}=\left(y-1\right)^{\left(\frac{1}{3}\right)}\cdot\left(cos\left(x\right)\right)$

$\int_0^a\frac{x^2}{x+1}dx$

$\left(2k-1\right)\left(2k+1\right)$

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