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September 19, 2014

September 19, 2014

Posted by **Amar** on Tuesday, October 12, 2010 at 10:09pm.

- Math -
**Reiny**, Tuesday, October 12, 2010 at 10:44pmThis question deals with direction cosines

you must have come across the property

cos^2 α + cos^2 β + cos^2 γ = 1

cos^2 (2π/3) + cos^2 (π/4) + cos^2 γ = 1

1/4 + 1/2 + cos^2 γ = 1

cos^2 γ = 1 - 1/2 - 1/4

cos^2 γ = 1/4

cos γ = 1/2

γ = π/6 using only the first quadrant case

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