$\left(a^{n+2}b^{n+1}\right)^3$

$-5-\left(-8\right)-\left(-20\right)-18$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{5cos\left(5x\right)}{cos\left(-3x\right)}\right)$

$2f+w+f$

$-5\cdot5x^2$

$3x^4y^{\frac{1}{3}}+10x^4y^{\frac{1}{3}}-13x^2y^{-2}+20x^2y^{-2}$

$\int\frac{6}{3x^2-14x+8}dx$