If a line has direction ratios , then what is the sum of the squares of its direction cosines?

If a line has direction ratios < a + b, b + c, c + a >, then what is t

1.	If a line has direction ratios < a + b, b + c, c + a >, then what is the sum of the squares of its direction cosines?
A.	(a + b + c)2
B.	2 (a + b + c)
C.	3
D.	1
Answer» E.

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If a line has direction ratios < a + b, b + c, c + a >, then what is the sum of the squares of its direction cosines?

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