$\lim_{x\to\frac{\pi}{2}}\left(4\cos\left(-7x\right)\sec\left(5x\right)\right)$

$x^2+80x+400$

$\int\left(x^3\sqrt{a^2x^2+b^2}\right)dx$

$\frac{2x+6}{x^2+8x+15}$

$\left(x^3-10x\right)\left(9x^2+10x\right)$

$\left(x+5\right)^2+\left(x+2\right)^2-2\left(2-x\right)^2$

$\left(-148\right)+\left(-315+\right)+\left(-218\right)$