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1.Given : A-31-j+7kandB-51 + j +9k . The direc-tion cosine 'm' of the vector A +B is

Answer»

A+B = (3+5)i+(-1+1)j+(7+9)k = 8i+0j+16k

so, direction cosine m = cos∅ = 0/√8²+16² = 0



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