$2x\left(x^{\frac{-1}{2}}\right)$
$\sqrt{5}\sqrt{16}$
$\frac{1}{sin^2x}$
$4a^2-4ab+b^2$
$\frac{2x^2-7x-15}{x-5}$
$4x-5=4x-1$
$16n^2+24n+9$
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