$\lim_{h\to0}\left(\frac{\frac{1}{\sqrt[2]{x+h+1}}-\frac{1}{\sqrt{x+1}}}{h}\right)$

$\frac{x^3}{x^5}$

$\lim_{x\to\infty}\left(\frac{7x^3}{x^3-x^2+x+7}\right)$

$\lim_{x\to0}\left(3\sin\left(x\right)^{9\tan\left(x\right)}\right)$

$\int\left(\frac{6x-3}{\left(x+1\right)\left(x^2+4\right)}\right)dx$

$3x-5y=4\:\:\:$

$3x^4.x^6$