Additive inverse and multiplicative inverse of a rational number 2/3 are respectively, X and Y, then: X = 3/2 and Y = -2/3 X = -3/2 and Y = 2/3 X = 2/3 and Y = 3/2 X = -2/3 and Y = 3/2 .
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The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
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