1.

If a line makes angles α, β and γ with the positive directions of x, y and z axis respectively, then(a) cos2α + cos2β + cos2γ = 1(b) sin2α - sin2β + sin2γ = 1(c) cos2α + cos2β + cos2γ = 2(d) sin2α + sin2β+ sin2γ = 2

Answer»

Answer is (b) sin2α - sin2β + sin2γ = 1



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