$-2ab+4a^2b-6ab-6ab^2$

$\int x\left(7x^2+1\right)^7dx$

$\lim\:_{x\to\:0}\left(\frac{\sqrt{x+a+b}-\sqrt{a+b}}{x}\right)$

$\int\sin\left(2-5x\right)\sin\left(1+x\right)dx$

$\int_1^{1.2}\left(c^x\right)dx$

$4\left(x-5\right)-\left(4x-6\right)+3\left(5x-1\right)>\left(14x-8\right)-2\left(3x-4\right)$

$\left(5.10^4\right)\left(9.10^{-8}\right)$