$\frac{15a^5b^2}{5a^2b}$

$\left(+54\right)-\left(-63\right)$

$g\left(x\right)=\left(3-e^x\right)\left(2-x\right)$

$\csc\left(x\right)\left(\sec\left(x\right)-\cos\left(x\right)\right)$

$\frac{tan\left(x\right)}{tan\left(x\right)+cot\left(x\right)}$

$\frac{dy}{dx}2\sin^2\left(x\right)$

$\sqrt[3]{a}.\sqrt[9]{a^3}$