$\int\sqrt{9x-3}dx$

$\lim_{x\to0}\left(\frac{\left(1+x\right)^{\frac{1}{x}}}{e}\right)^{\frac{1}{2}}$

$\frac{d}{dx}\left(x^2\right)=\frac{d}{dx}\left(\frac{x+y}{x-y}\right)$

$4-2y;\:x=2;\:y=-1$

$\left(\frac{x+1}{x^2-4x}\right)$

$\frac{dy}{dx}=\frac{\left(y+1\right)\left(x+3\right)}{\left(y+2\right)\left(x-1\right)}$

$107\left(90.50\right)$