$sin\left(x\right)^2\:+2sin\left(x\right)+1=0$

$\frac{12-17t+6t^2}{2t-3}$

$x^2+24x+63$

$43.36+7.45$

$\lim\:_{x\to\:\:-7}\left(\frac{x^2+14x+49}{x+7}\right)$

$\lim_{x\to0}\left(\frac{\left(2\sin\left(x\right)\right)}{2a-2a\cos\left(x\right)}\right)$

$\tan\left(x\right)\sin\left(x\right)+\cos\left(x\right)=2\tan\left(x\right)$