$\int_0^ycos\left(xy\right)^2dx$

$\frac{2}{2x+3}+\frac{4}{2x-3}=\frac{5x+6}{4x^2-9}$

$\left(a^x+a^{x+1}+a^{x+2}\right)\left(a+1\right)$

$f\left(x\right)=2\left(x+5\right)$

$\left(x^4+2y^3\right)^2$

$\frac{a^{-4}\cdot\left(6^{2}\right)^{-1}\cdotb^{2}}{2^{3}\cdot3^{2}\cdota^{6}\cdotb^{-7}}$

$sen^2x\left(ctgx-cscx\right)\frac{1}{ctgx\:csc\left(x\right)}$