$\frac{3}{x-1}+\frac{1}{x}=2$
$7x^2+10x-8$
$\sqrt{81x^4}y^4$
$9m^2-91m+10$
$\frac{x^4-16}{x^2+4}$
$sin\left(x\right)+tan\left(x\right)$
$\csc^4a-\cot^4a$
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