The direction cosines of vector \[\mathbf{a}=3\mathbf{i}+4\mathbf{j}+5\mathbf{k}\] in the direction of positive axis of x, is [MP PET 1991]

The direction cosines of vector \[\mathbf{a}=3\mathbf{i}+4\mathbf{j}+5

1.	The direction cosines of vector \[\mathbf{a}=3\mathbf{i}+4\mathbf{j}+5\mathbf{k}\] in the direction of positive axis of x, is [MP PET 1991]
A.	\[\pm \frac{3}{\sqrt{50}}\]
B.	\[\frac{4}{\sqrt{50}}\]
C.	\[\frac{3}{\sqrt{50}}\]
D.	\[-\frac{4}{\sqrt{50}}\]
Answer» D. \[-\frac{4}{\sqrt{50}}\]

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The direction cosines of vector \[\mathbf{a}=3\mathbf{i}+4\mathbf{j}+5\mathbf{k}\] in the direction of positive axis of x, is [MP PET 1991]

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