$49v^2-4$

$5a^2-90a+81$

$\lim_{x\to\frac{2}{3}}\left(\frac{1-sin\left(x\right)}{csc\left(x\right)}\right)$

$18ax^{12}+\:48a^3-8a^2-4x\:entre\:3ax^4$

$3x-4\leq\frac{3x}{4}+\frac{1-x}{3}$

$\frac{1}{3}-\frac{1}{3p-2}=\frac{1}{p-1}$

$3\left(\frac{6}{1}\right)x^{4-y}\left(16y^{8x}\right)$