$n^2-6n-40=0$
$3-\left(8+9\right)-\left[2+8\right]$
$x^3-0x^2+3x+2$
$\int\frac{20x+30}{\left(x+1\right)^2\left(x+2\right)^2}dx$
$\frac{\left(3x^2-7x^2+6x+8\right)}{x-1}$
$\csc2\left(x\right)=\frac{\csc\left(x\right)}{2\cos\left(x\right)}$
$-4x^2+16x-16$
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