$\frac{\cot\left(x\right)}{\tan\left(x\right)}+1=\csc\left(x\right)^2$
$x^2-21x+20<0$
$4x^2+24x+11=0$
$\left(2x+\frac{y}{2}\right)^5$
$\frac{x^2+2x-15}{x^2-4x+3}$
$\int x^3\left(9+x^4\right)^7dx$
$\left(2x^5-3x^2\right)^3$
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