$\frac{k^7}{k^{13}}$
$x^2\le1$
$\left(3x+14y\right)^3$
$tan\left(40\right)=-1$
$\frac{x-4}{3x}+1\frac{x+4}{x}$
$\sqrt{2-\sqrt{3}}\cdot\sqrt{2+\sqrt{3}}$
$\left(-2\right)^2-\left(-4\right)^2-4^2$
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