$\lim_{x\to-3}\left(\frac{-5}{x^2+6x+9}\right)$

$-\frac{1}{5}+0.3$

$\frac{d}{dx}lnx^y\:=\:ln\:y^x$

$\left(\sin\left(y\right)-\cos\left(y\right)\right)^2$

$\log\left(d\right)+z\log\left(q\right)$

$\tan\left(2x\right)\sin\left(x\right)-\sin\left(x\right)-\tan\left(2x\right)+1$

$\frac{\left(x^2+2x-8\right)}{\left(x+4\right)}$