$\lim_{x\to2}\left(6+2x-x^2\right)^3$

$\lim_{x\to\infty}\left(\frac{x-\ln\left(2^x+1\right)}{x}\right)$

$-7+1\cdot16-1\cdot1^3-1\cdot5^2$

$1-\:2\sin\:^2\left(11x\right)$

$\left(x-1\right)^2-\left(x-3\right)^2-1\ge3x-4$

$4a^4b^3x^2-2a^2b^2x^6$

$\left(5m^3n\right)\left(8mn^3\right)+\left(6mn\right)\left(4m^2n^2\right)\left(mn\right)-7m^4n^4$