$66,54+9,393$

$\left(4h\:+\:2\right)\left(5h\:-\:3\right)$

$\int_{\frac{\pi}{4}}^{\frac{\pi}{2}}\left(\cot\left(3x\right)\csc^2\left(3x\right)\right)dx$

$\left(-5\right).4+3.\left(-10\right)$

$\left(9x^3y^2-3z^4\right)^2$

$13\cdot2\cdot a\cdot b\cdot b\cdot c\cdot c\cdot c$

$\frac{5}{3}n^2m^3+\frac{1}{2}n^3m^2+\left(-\frac{1}{3}n^2m^3\right)+2n^3m^2$