$\left(y-\frac{2}{7}\right)\left(x-\frac{1}{9}\right)$

$6t+4\le-2$

$\frac{x^2}{\:\left(1+2x\right)^2}$

$4-3n-3$

$\frac{4x^2-8x+3}{36x^3+66x^2+40}$

$\frac{10a^3x^2y}{-20axy}$

$\sin\left(x+60\right)=\frac{\sin\:\left(x\right)}{2}+\frac{\sqrt{3}\cos\:\left(x\right)}{2}$