1.

If a line makes an angles α, β, γ with the coordinate axes, then find the value of cos2α + cos2β + cos2γ.

Answer»

cos2α + cos2β + cos2γ

= 2(cos2α + cos2β + cos2γ) −3

= 2 − 3     (∵ cos2α + cos2β + cos2γ = 1)

= −1



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