$\left(a-2\right)^3+1+1-\left(a-2+a-2+a-2\right)$

$\left(\frac{5}{6}a^2-9\right)\left(\frac{5}{6}a^2+9\right)$

$\int\ln\left(\frac{x+1}{x}\right)dx$

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

$\left(x+\frac{9}{5}\right)^2$

$\tan\left(\arcsin\left(\sqrt{\frac{3}{4}}\right)\right)$

$\left\{\left(x^2+y^2\right).\:2\right\}+\left\{\left(x^2-y^2\right).2\right\}$