MTH103 TMA2 Questions and Solutions : Find the direction cosine [l,m,n] of the r=2i+4j-3k

Find the direction cosine [l,m,n] of the r=2i+4j-3k

a) \[\frac{2}{\sqrt(29)},\frac{4}{\sqrt(29)},\frac{-3}{\sqrt(29)}\]
b) \[\frac{2}{\sqrt(27)},\frac{4}{\sqrt(27)},\frac{-3}{\sqrt(27)}\]
c) \[\frac{-1}{\sqrt(29)},\frac{5}{\sqrt(29)},\frac{4}{\sqrt(29)}\]
d) \[\frac{2}{\sqrt(27)},\frac{4}{\sqrt(27)},\frac{-3}{\sqrt(27)}\]

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