$2\:csc\left(x\right)=\frac{\sin\left(x\right)}{1+\cos\left(x\right)}+\frac{1+\cos\left(x\right)}{\sin\left(x\right)}$
$3x^2+5x-4=0$
$n^2-3n-238=0$
$\frac{11}{4x-5}-\frac{8}{x+1}=6$
$\frac{3a}{\sqrt{2}+\sqrt{x}}$
$\frac{3x^2-3x-1}{x}$
$x^6+27y^3$
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