$$5x^2+12x+15$$

$$\log\left(a\right)=\log\left(b\right)-\log\left(c\right)+1.3\log\left(d\right)$$

$$\lim_{h\to\infty}\left(\frac{3h+2xh^2+x^2h^3}{4-3xh-2x^3h^3}\right)$$

$$\left(1+t^2\right)y'+2ty=2t$$

$$\left(2x^4y^2\right)\left(4x^3y^2\right)$$

$$36x^2-12xy^2+y^4$$

$$\frac{dy}{dx}=\left(5x^3+3x+4\right)$$