$5\left(xh\right)^3+7\left(xh\right)-8-\left(5x^3+7x-8\right)$

$\int\left(3ax^2\sin\left(2ax\right)\right)dx$

$\frac{x+y}{4}=13$

$\lim_{x\to0}\left(\frac{n^2}{9\left(n+1\right)^2}\right)$

$\left(-3x^{4}-2x^{3}-3x^{2}-7x-10\right):\left(x+1\right)$

$\frac{1}{3}x^2y\frac{5}{2}xy^2$

$30+n\ge50$