$\csc^2k=1+cot^2k$
$\left(\frac{4}{x^2-1}\right)^2+7\left(\frac{2}{x-1}\right)+1$
$\int\:\frac{x^3}{\:\:x^2+6x+9}\:dx$
$\int10\tan^2\left(5x\right)dx$
$-5m-7m+m$
$y+1-y$
$-\frac{5}{\frac{1}{4}}$
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