$\frac{\sin\left(x\right)^4-\cos\left(x\right)^4}{\cos\left(x\right)^2-\sin\left(x\right)^2}$

$\int\frac{2}{\left(5+4x-x^2\right)}dx$

$7+\left|-10-\left(-9-\left(-2\right)\right)\right|+\left(9-5\right)$

$\left(5a^2+2b^5\right)^3$

$-12-\left(-8\:+10\:\right)$

$\frac{1-x^9}{1-x^3}$

$\left(\frac{2}{9}x^5-x^2\right)^2$