alpha beta gamma are the angles made by the vector a=3i-6j+2k with directions of the coordinate axes then find cos alpha cos beta cos gamma
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dr's of equation is (3,-6,2)
to find DC's
√3^2+-6^2+2^2 =7
cosalpha= 3/7 , cosbeta =-6/7 ,cosgamma =3/7
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