$\left(3-4x\right)^2\left(1-12x+60x^2-160x^3\right)$

$2abc+a^2b+a^2c+b^2a+cb^2+c^2b+cab+c^2a+abc$

$6b+5-2b+6$

$\lim_{x\to1}\left(\frac{lnx}{12x-x^2+1}\right)$

$\left(x^3-225\right)$

$4+4+3.2+3.2$

$\lim\:_{x\to\:0}\left(\frac{\left(e^{2x}-1\right)\left(ln\left(n+x^2\right)\right)}{\left(1-cos\left(3x\right)\right)^2}\right)$