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Answer all the questions Find the angl...

Answer all the questions
Find the angle between the planes `r. (hat(i) - 2 hat(j) - 2hat(k) ) = 1 and r. ( 3 hat(i) - 6 hat(j) + 2 hat(k) ) =0`.

Text Solution

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The correct Answer is:
`theta = cos^(-1) (11)/(21)`
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