$\int\left(u^2-1\right)^{-\frac{1}{2}}du$

$20ab+12ba-15xy+6xy-ab+2yx$

$\int4x^3e^{2x+1}dx$

$b.n-\frac{b}{n}=96$

$\left(3p-5q\right)\left(9p^2+15pq+25q^2\right)$

$2x^3-7x$

$\left(cos^2\left(x\right)-cos\left(x\right)\right)\left(1+sec\left(x\right)\right)=-sin^2\left(x\right)$