$\lim_{x\to0}\left(\frac{\left(e^x-x-1\right)}{\left(x^3+cos\left(x\right)-1\right)}\right)$

$6m^3n^2,\:9m^2n^3,\:18m^4n^5$

$\left(6^{12}\cdot2^{12}\right)$

$\left(a^2+3a+2\right)\left(a^2-3a+2\right)$

$\int_0^{\frac{\pi}{2}}\left(sin^{n-2}x\:cos^2x\right)dx$

$\left(x+4\right)^2=8x+\left(2x-1\right)^2$

$\lim_{x\to0}\left(\frac{sin4}{tan4x}\right)$