$\lim_{x\to0}\left(\frac{1-e^{2x}}{x}\right)$

$-2\left(-8-9-10\right)-10\left(-2-1\right)$

$\left(3x-10\right)\left(3x+10\right)$

$\left(8-11\right)-\left(3+1-4-6\right)$

$\frac{\sqrt[3]{\left(x+h\right)^2}+\sqrt[3]{x\left(x+h\right)}+\sqrt[3]{x^2}}{h}$

$-12n^3\cdot n^4\cdot3n^4$

$\left(4m^2-n^2\right)\cdot\left(4m^2+n^2\right)$