$\left(p+q\right)^2+6\left(p+q\right)+9$
$\lim_{z\to4}\left(\frac{z-4}{\sqrt{z}-2}\right)$
$\int\left(\frac{4x+6}{x^2+3x+1}\right)dx$
$c^2c^5$
$8-1000$
$\frac{1-tan^2x}{1+tan^2x}=2cosx-1$
$\frac{1}{\cos\left(x\right)}-\sin\left(x\right).$
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