$\left(x+2y+7\right)^2$

$36.4-12.72$

$\left(12x+5y+7\right)^2$

$\frac{x^{6}+\left(a+b\right)x^{5}+ax^{4}+2x+2}{x^{2}-2x+1}$

$\frac{2sin\left(x\right)cos\left(x\right)-cos\left(x\right)}{1-sin\left(x\right)+sin^2\left(x\right)-cos^2\left(x\right)}$

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

$16cosx-3=\sqrt{128}-3$