$\left(-436\right)+183+\left(-191\right)$

$\csc\left(x\right)^2\:-2$

$6b-2b-3a$

$2\sin\left(x\right)=\frac{2\sin\left(x\right)-\sin\left(2x\right)}{1-\cos\left(x\right)}$

$\frac{49x+13}{35x^2+10x}\cdot\frac{x+5}{6\left(7x+5\right)}$

$\left(36-2\right)^2\left(36-2\right)^2$

$\frac{1}{1+\tan^2\left(b\right)}=\left(1-\sin\left(b\right)\right)\left(1+\sin\left(b\right)\right)$