$4\left(-\frac{1}{2}\right)^3-2\left(-\frac{1}{2}\right)^2+2\left(-\frac{1}{2}\right)-1$

$\frac{\frac{3x^2}{\left(x^2+1\right)^2}}{\frac{x}{\left(x^2+1\right)}}$

$x+3\left(\sqrt{\left(1-x\right)}+2\right)$

$\frac{\left(3a^3+5a^2+2a+3\right)}{\left(3a+2\right)}$

$3\sqrt{49}$

$f\left(x\right)=\frac{\cot\left(x\right)-\csc\left(x\right)}{\cot\left(x\right)+\csc\left(x\right)}$

$-\frac{2}{5}x=6$