$\left(2x-5\right)\left(2x^2+5\right)$

$42x^{\left(5\right)}y^{\left(2\right)}+7x^{\left(3\right)}y^{\left(7\right)}-9x^{\left(6\right)}y$

$\tan^2\left(a\right)=\frac{1}{\cos^2\left(a\right)}-1$

$\cos\left(\sin^{-1}\frac{4}{5}\right)$

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

$18-\left(-31\right)$

$x^2-4x=-3$