$\left(a^2-9a+18\right)\left(a^2-2a-3\right)$

$\tan\left(x-\frac{3\pi}{4}\right)=\frac{\sin x+\cos x}{\cos x-\sin x}$

$\left(x+5\right)\left(x+2\right)=\left(2x+4\right)\left(x-3\right)$

$\sqrt{2}l+\sqrt{2}=\sqrt{8}$

$\frac{x^3+3}{2x^2+2}$

$\left(a+b+c\right)^2=1$

$\left(1-\sin^2x\right).\csc^2x=1$