$3 x + 1 \leq 12$

$\lim_{x\to0.001}\left(\frac{sen\:2x}{4x}\right)$

$\int\left(\frac{2z+3}{5z+6}\right)d.$

$\left(x^3+12\right)\left(x^2+12\right)\left(x+48\right)$

$\frac{1}{4}y'-x^2=0$

$\sin\left(a+b\right)\cos a+\cos\left(a+b\right)\sin a$

$\int_0^{\sqrt{2}}\left(3xe^{x^2+1}\right)dx$