$1-\frac{\cos^2\left(x\right)-1}{1-\cos\left(x\right)}$

$\int\:\frac{t+1}{-t^3-t}dt$

$\left(8\right)\left(-2\right)\left(4\right)\left(-3\right)$

$\left(\left(g-h\right)\left(g^2-3gh+2h^2\right)\right)=\left(g^3+4g^2h^2-2h^{\:3}\right)$

$4f^{-5}\cdot2f^{-3}$

$\frac{3x^5+2x^2-5}{x^5-3x^3+8}$

$2sin^2x-cosx+1=0$