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Math·Geometry and Trigonometry·Right triangles and trigonometry

easy

If $x$ is the radian measure of an angle, where $0<x<\frac{\pi }{2}$ and $\tan x=k$, which of the following is the value of $\tan (-x)$?

A

$k$

B

$-k$

C

$\pi -k$

D

$k-\pi$