[" Find the direction cost "gamma" are d...

[" Find the direction cost "gamma" are direction cosines of a line,then prove that ":sin^(2)alpha,+sin^(2)beta+sin^(2)gamma=2],[" If "cos alpha,cos beta,cos gamma" are direction cosines of a line,then prove that ":sin^(2)alpha,+sin^(2)beta+sin^(2)gamma=2],[" 17.Vector Equation of a Straight Line."]

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