$\int\tan\left(x-1\right)^2dx$

$11x-8y+2y-7x$

$\int\:\left(\frac{x+2}{\sqrt{x^2-24}}\right)dx$

$\int e^{\frac{x}{3}}\sin\left(x\right)dx$

$sen\:\left(x\right)^4\:-\:cos\:\left(x\right)^4=sen\:\left(x\right)^2-\:cos\:\left(x\right)^2$

$pq-pq-1$

$\left(xy^2-9\right)\left(xy^2+2\right)$