$x+\frac{1}{2}<4$

$\csc\theta-\sin\theta=\frac{\cot^2\theta}{\csc\theta}$

$\left(\frac{2}{3}xy^2+\sqrt{2z^4}\right)^3$

$400-1600+3000$

$x^4+x^3-19x^2-49x-30$

$3x+\frac{1}{4}-x+1\frac{1}{2}and4x+1\frac{3}{4}$

$\frac{\left(\cos\theta+\text{sen}\theta\right)}{\text{sen}\theta}$