$\left(\frac{1}{2}+ab\right)\left(\frac{1}{2}-ab\right)-\left(a^2b^2-\frac{3}{4}\right)$

$-65+4+12$

$\int\left(\frac{\left(x+2\right)}{\left(4x+5\right)^2}\right)du$

$\int-\frac{1}{x^2\left(x+1\right)\left(x-1\right)}dx$

$\left(6a^2+2b\right)^3$

$7x^2+126x-81$

$\int15e^{3x}dx$