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

$\left(2a^5\right)^8$

$\frac{d}{dz}\left(\frac{2x-3y}{z-2y}+xz^2\right)$

$5^6.5^6$

$9x^2-30x+5$

$4ln\left(x-2\right)+ln\left(x+3\right)$

$6a-11a-10$