$\left(3a^6b^3+12\right)\left(3a^6b^3-11\right)$

$4x^2\left(x-6\right)+12x\left(6-x\right)$

$\int x\left(e^{\left(2x\right)}\cdot cos\left(e^x\right)\right)dx$

$1-16x^4$

$\left(2x+\sqrt{y}\right)\left(2-\sqrt{y}x\right)$

$86.978'92+6.879+95$

$\int\left(-8y^2\right)dx$