$x^2-12x+27$

$109\cdot\left(-53\right)+\left(-47\right)\cdot109$

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

$4x^8-24x+36$

$\frac{3x^4+5x\:-18}{x-1}$

$6x^2-13x+6<0$

$\sqrt{\left\{\frac{\left[\left(a-b\right)\ast\left(a+b\right)\right]}{\left[\left(a+b\right)^2\ast\left(a^2-b^2\right)\right]}\right\}}$