$tan\left(x-\pi\right)=\frac{tan\left(x\right)-tan\left(\pi\right)}{1+tan\left(x\right)tan\left(\pi\right)}$

$-\:\:32-\:b^7$

$y'=2+2y+x+xy$

$\left(\frac{\left(-6^2\right)-\left(-2^2\right)}{\left(-2^2\right)-\left(-6^2\right)}\right)$

$4+-13+-8$

$\frac{\cos^2\left(x\right)-5\sin^2\left(x\right)}{1-6\sin^2\left(x\right)}$

$-100-50-50$