$3\left(1.2\right)^4-3\left(1.2\right)^3-\left(1.2\right)^2+3\left(1.2\right)-1\:$

$\int\frac{7x^2-9x+5}{x\left(x-1\right)^2}dx$

$-5x+6+4y-12+6y-9x$

$\int r\left(x\cdot\sqrt{a^2-x^2}\right)dx$

$y=\frac{e^{2x}}{ln3x}$

$\left(\frac{xy}{2}-1\right)\left(\frac{xy}{2}+1\right)$

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