$-8a^3b+6a^3b-2a^3b+a^3b$

$\int_0^{\pi}9\cdot8^{\sin\left(x\right)}\cos\left(x\right)dx$

$5ab-3a\cdot\frac{1}{2}b$

$\lim_{x\to\frac{\pi}{2}}\left(\tan\left(x\right)\right)^x$

$\int y^3\left(2y^3-3\right)dx$

$\frac{x^4-x^3+x^2-3x-6}{x-2}$

$\int\sqrt[50]{\cot\left(x\right)}\csc^2\left(x\right)dx$