how to do a proof for vector angles

Question:how to do a proof for vector angles

Posted: LEETZ 13 Product: Maple

November 24 2010

HEY EVERYONE,

HOW CAN I PROVE THE FOLLOWING BOTH ON PAPER AND USING MAPLE 13.

HAVING THE VECTOR A= (A1,A2,A3)

PROVE THAT

$cos(alpha)^2 + cos(beta)^2 +cos(theta)^2 =1$

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