Find the angle between two planes ( vec{r}.(2 hat{i}- hat{j}+ hat{k}) – McqOptions

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1.	Find the angle between two planes ( vec{r}.(2 hat{i}- hat{j}+ hat{k})=3 ) and ( vec{r}.(3 hat{i}+2 hat{j}-3 hat{k}) )=5.
A.	(cos^{-1} u2061 frac{1}{ sqrt{22}} )
B.	(cos^{-1} u2061 frac{1}{ sqrt{6}} )
C.	(cos^{-1} u2061 frac{1}{ sqrt{132}} )
D.	(cos^{-1} u2061 frac{1}{ sqrt{13}} )
Answer» D. (cos^{-1} u2061 frac{1}{ sqrt{13}} )

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