If a, b, and c are the angles made by a vector with X, Y, Z axis respectively. Then cos^2a + cos^2B + cos^2c is?
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Answer:
-1
Step-by-step explanation:
cos2α+cos2β+cos2γ =2(cos 2 α+cos 2 β+cos 2 γ)−3
=2−3=−1
(∵cos 2 α+cos 2 β+cos 2 γ=1)
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