1.

The acute angle between the two planes ` x + y + 2z` = 3 and 3x - 2y + 2z = 7 ` is …….A. ` sin^(-1) ((5)/(sqrt(102)))`B. ` cos^(-1) ((5)/(sqrt(102)))`C. ` sin^(-1) ((15)/(sqrt(102)))`D. ` cos^(-1) ((15)/(sqrt(102)))`

Answer» Correct Answer - b
`cos^(-1) ((5)/(sqrt(102)))`


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