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Question
Choose correct alternatives :
The angle between the planes `bar"r".(hat"i" - 2hat"j" + 3hat"k") + 4 = 0 and bar"r".(2hat"i" + hat"j" - 3hat"k") + 7 = 0` is
Options
`pi/(2)`
`pi/(3)`
`cos^-1(3/4)`
`cos^-1(9/14)`
MCQ
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Solution
`cos^-1(9/14)`
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