$-2\left(4-a\right)$

$\int_1^2\left(6xe^{x^2}\right)dx$

$\frac{a+1}{2a+3}+\frac{3a+2}{b+1}$

$\int\frac{cosx+sen2x}{senx}dx$

$\left(5m^3\right)x\:\left(2m^3\:-\:8\right)$

$\left(\:x^{10}\:-5y^2\right)^2$

$\frac{\sin\left(5x\right)+\sin^2x}{\sin\left(5x\right)+\sin\left(x\right)}$