The angle between the pair of planes represented by equation\[2{{x}^{2}}-2{{y}^{2}}+4{{z}^{2}}+6xz+2yz+3xy=0\]is

\[{{\cos }^{-1}}\left( \frac{7}{\sqrt{84}} \right)\]

\[{{\cos }^{-1}}\left( \frac{1}{3} \right)\]

\[{{\cos }^{-1}}\left( \frac{4}{21} \right)\]

\[{{\cos }^{-1}}\left( \frac{4}{9} \right)\]

The angle between the pair of planes represented by equation\[2{{x}^{2

1.	The angle between the pair of planes represented by equation\[2{{x}^{2}}-2{{y}^{2}}+4{{z}^{2}}+6xz+2yz+3xy=0\]is
A.	\[{{\cos }^{-1}}\left( \frac{1}{3} \right)\]
B.	\[{{\cos }^{-1}}\left( \frac{4}{21} \right)\]
C.	\[{{\cos }^{-1}}\left( \frac{4}{9} \right)\]
D.	\[{{\cos }^{-1}}\left( \frac{7}{\sqrt{84}} \right)\]
Answer» D. \[{{\cos }^{-1}}\left( \frac{7}{\sqrt{84}} \right)\]

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The angle between the pair of planes represented by equation\[2{{x}^{2}}-2{{y}^{2}}+4{{z}^{2}}+6xz+2yz+3xy=0\]is

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