$3^2+13x-2$

$y+x^2=4y$

$\frac{dy}{dx}2xy+4x^{\frac{3}{2}}y^{-\frac{1}{2}}$

$\frac{\sin2\left(x\right)}{\cos^2\left(x\right)}=2\tan\left(x\right)$

$\frac{a^2-5a+6}{a-3}$

$\left(a^4+a^3b+a^2b^2+ab^3+b^4\right)\cdot\left(a-b\right)$

$3=x\cdot\left(\cos\left(30\right)\right)$