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

$cos2x-5cosx-5=0$

$\left(-x+2\right)\left(63-x\right)$

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

$\int\frac{\left(2x\right)}{\left(1+x^2\right)}dx$

$m^4-20m^2+100$

$\frac{d}{dx}\left(3x^6-2x^4\right)^2$