$9^2+12x+4$

$x ^ { 2 } - 8 x + 11 = 0$

$\frac{4cos\left(x\right)}{\left(1-sin\left(x\right)\right)\left(1+sin\left(x\right)\right)}$

$b^{3}\cdotb^{7}$

$\int\frac{1}{u\sqrt{a^{2}-x^{2}}}dx$

$\left(x+2\right)^2-\left(x-2\right)^2+\left(x+3\right)\left(x-3\right)$

$\int\frac{1}{x^3+2x^2+x+2}dx$