The reflection of the point ( α , β , γ ) in the x y -plane is, ( α , β , 0 ), ( 0 , 0 , γ ), ( − α , − β , γ ), ( α , β , − γ )

The reflection of the point ( α , β , γ ) in the x y -plane is

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The reflection of the point $(\alpha, \beta, \gamma)$ in the $x y$-plane is

MathematicsThree Dimensional Geometry

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The correct answer is:
$(\alpha, \beta,-\gamma)$

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