Assertion (A) : if a line makes angles If a line makes angles α, β, γ with the positive directions o

Assertion (A) : if a line makes angles If a line makes angles α, β, γ with the positive directions of the coordinate axes, then the value of sin²α + sin²β + sin²γ is 2
Reason (R): the sum of squares of the direction cosines of a line is 1