Question: Prove Equations 1.10 and 1.11 from trigonometric considerations. cos a + cos + cos y = 1 cos = cos a cos a' + cos

Prove Equations 1.10 and 1.11 from trigonometric considerations.

cos a + cos + cos y = 1 cos = cos


cos a + cos + cos y = 1 cos = cos a cos a' + cos cos ' + cos y cos y' (1.10) (1.11)

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