$\frac{5}{x^2}<1$
$\left(k+8\right)\left(k-11\right)$
$cot^2u-csc^2u$
$\left(xy+x\right)dy=\left(x^2+1\right)dx$
$\left(6^0\right)^{16}$
$\sqrt{\frac{a-b}{\left(a-b\right)^2}.\frac{a+b}{a^2-b^2}}$
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