$\lim_{x\to-2}\left(\frac{3x^2+x-10}{x+2}\right)$

$3x-7\ge17$

$\frac{\sin\left(x\right)\cdot\cot\left(x\right)}{\sec^2\left(x\right).\tan^2\left(x\right)}$

$\lim_{u\to\frac{\pi}{4}}\left(\frac{tan\left(u\right)-cot\left(u\right)}{2u-\frac{\pi}{2}}\right)$

$x\frac{dv}{dx}=\frac{1-2v^2}{3v}$

$\lim_{x\to+\infty}\left(\left(1-\frac{1}{2x}\right)^{3x}\right)$

$x^2-8x-17=0$