Assertion (A): If a line makes angles α, β, γ with positive direction of the coordinate axes, then sin^2 α+ sin^2 β+ sin^2 γ=2. Reason (R): The sum…

Assertion (A) : If a line makes angles $\displaystyle \alpha, \beta, \gamma$ with positive direction of the coordinate axes, then $\displaystyle \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma=2$. Reason (R): The sum of squares of the direction cosines of a line is $\displaystyle 1$ .