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Let P(1,-2,5) be the foot of the perendicular drawn from the origin to the plane pi_(1) and the same P be the foot of the perpendicular from (1,2,-1) to the planes, pi_(2). Then the acute angle between the planes pi_(1)andpi_(2) is |
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Answer» `COS^(-1)((19)/(SQRT(390)))` |
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