Find the angle between the planes ( vec{r}.(4 hat{i}+ hat{j}-2 hat{k} – McqOptions

MCQOPTIONS

1.	Find the angle between the planes ( vec{r}.(4 hat{i}+ hat{j}-2 hat{k}) )=6 and ( vec{r}.(5 hat{i}-6 hat{j}+ hat{k}) )=7?
A.	(cos^{-1} u2061 frac{12}{ sqrt{1302}} )
B.	(cos^{-1} u2061 frac{1}{ sqrt{1392}} )
C.	(cos^{-1} frac{ u206123}{ sqrt{102}} )
D.	(cos^{-1} u2061 frac{15}{ sqrt{134}} )
Answer» B. (cos^{-1} u2061 frac{1}{ sqrt{1392}} )

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