$\lim_{x\to0}\left(\frac{\cot\left(x\right)}{-\csc^2\left(x\right)}\right)$

$\left(-\frac{7}{120}x\right)\left(x-2\right)\left(x-5\right)$

$5-\left(\sqrt{25}.\sqrt{25}\right)$

$5x-2\left(60-x\right)\ge90$

$6\left(1\right)\left(3\right)$

$\frac{dy}{dx}=\frac{\left(1-3y^4\right)}{12xy^3}$

$\frac{2^{x+1}}{2^x-1}$