$\lim_{x\to\frac{\pi}{2}}\left(\frac{2x-\pi\sin\left(x\right)}{x-\frac{\pi}{2}}\right)$

$\frac{dy}{dx}=\frac{1}{2x+y+1}$

$\frac{\sin\left(x\right)}{\cos\left(x\right)}+2\sin\left(x\right)\cos\left(x\right)$

$x^2-2x+2=3$

$d^2\left(14d^2b\right)$

$\left(-8\right)\cdot2+\left(-5\right)\cdot\left(-3\right)$

$v^2+3v-2=0$