$a^2-2ab+b^2;a=2;b=-3$

$\left(x-2\right)^2-\left(x+1\right)^2$

$\left(x-1\right)\left(3x^2+3\right)$

$\frac{\cos\left(x\right)}{\csc\left(x\right)}\cdot\frac{\csc\left(x-1\right)}{\csc\left(x-1\right)}$

$cos^2x-sin^2x=1$

$g\left(x\right)=\cos\left(2x+4\right)^4$

$5e^{-1-3}$