$3x-x+6x^2-2-4+6+5x$

$\lim_{x\to0}\left(\frac{\sin\left(5t\right)}{2t}\right)$

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

$2\sin3x-\sqrt{3}=0$

$\tan\left(x\right)+2\sin^2\left(x\right)$

$\frac{x^2+15-5}{-x+3}$

$16\:.\:\left(-15\right)$