$\frac{1-\csc^2}{\cot}=-\cot$
$\cos2x+\sin\left(4x\right)=0$
$\frac{5x^2+15x}{x^2+6x+9}$
$\left(-3\right)-\left(-2\right)+\left(-6\right)-\left[\left(-6\right)+18\right]$
$\int\frac{x+3}{\left(x-1\right)\left(x^2+1\right)}dx$
$x^3-7x^2+15x-9$
$-2^23$
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