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If a line makes an angles α, β, γ with the coordinate axes, then find the value of cos2α + cos2β + cos2γ. |
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Answer» cos2α + cos2β + cos2γ = 2(cos2α + cos2β + cos2γ) −3 = 2 − 3 (∵ cos2α + cos2β + cos2γ = 1) = −1 |
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