$\lim_{x\to0}\left(\frac{36x\cos\left(x\right)-36\sin\left(x\right)}{x\sin^2\left(x\right)}\right)$

$\lim_{x\to0}\:\left(\frac{x^6+x}{3\sqrt{x^3+x^6}}\right)$

$\frac{dy}{dx}=e^2x+3y$

$\left(x^3+x^2+1\right)\left(x-1\right)\left(x+5\right)$

$4cos^2\left(x-1\right)=0$

$f\left(x\right)=\ln\left(\frac{1}{x}\right)$

$140+147+153+156+157+158+162+162+162+172+175+183+184+186+189$