$4x^2+72x+9$

$\left(3x+8\right)\left(y^2+4\right)\left(dx\right)-4y\left(x^2+5x+6\right)dy=0$

$\frac{3}{4}x^2+\frac{2}{4}x^2-\frac{3}{4}x^2$

$\frac{\sin\left(x\right)^2}{2}=\frac{\cos\left(2x\right)}{4}$

$\lim_{x\to0}\left(x\:sen\:\frac{5}{x}\right)$

$\int\:4x^2sin\left(6x\right)dx$

$\left(-x+5\right)\frac{dy}{dx}=y$