$x\left[3\left(x-2\right)-2x+1\right]$

$a=\cot^3\left(x\right).\tan\left(x\right)+\sin^2\left(x\right).\csc^2\left(x\right)$

$\lim_{x\to\infty}\left(\cos\left(\frac{12}{x}\right)\right)^{x^2}$

$x^5+3x^2=0$

$\frac{x^3-4x^2+7x-6}{x-1}$

$\int6\sin^2\left(3x\right)dx$

$\int x\cdot\left(1-x\right)^6$