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?

\(cos^{-1}⁡\frac{12}{\sqrt{1302}}\)

\(cos^{-1}⁡\frac{1}{\sqrt{1392}}\)

\(cos^{-1}\frac{⁡23}{\sqrt{102}}\)

\(cos^{-1}⁡\frac{15}{\sqrt{134}}\)

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

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.	\(cos^{-1}⁡\frac{12}{\sqrt{1302}}\)
B.	\(cos^{-1}⁡\frac{1}{\sqrt{1392}}\)
C.	\(cos^{-1}\frac{⁡23}{\sqrt{102}}\)
D.	\(cos^{-1}⁡\frac{15}{\sqrt{134}}\)
Answer» B.

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