$\left(q-f\right)^2$

$\frac{3}{x^2+x+1}+\frac{5}{x+2}$

$( x ^ { 3 } + 3 y ) ^ { 2 }$

$\left(-10x^9+4\right)^2$

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

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

$5.55-33$