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.

\(cos^{-1}⁡\frac{1}{\sqrt{22}}\)

\(cos^{-1}⁡\frac{1}{\sqrt{6}}\)

\(cos^{-1}⁡\frac{1}{\sqrt{132}}\)

\(cos^{-1}⁡\frac{1}{\sqrt{13}}\)

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

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.	\(cos^{-1}⁡\frac{1}{\sqrt{22}}\)
B.	\(cos^{-1}⁡\frac{1}{\sqrt{6}}\)
C.	\(cos^{-1}⁡\frac{1}{\sqrt{132}}\)
D.	\(cos^{-1}⁡\frac{1}{\sqrt{13}}\)
Answer» D.

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If the planes \(A_1 x+B_1 y+C_1 z+D_1\)=0 and \(A_2 x+B_2 y+C_2 z+D_2\)=0 are at right angles to each other, then which of the following is true?
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.
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