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The angle between i and line of the inte...

The angle between `i` and line of the intersection of the plane ` vec r . ( hat i+2 hat j+3 hat k)=0` and `vec r . (3 hat i+3 hat j+ hat k)=0` is a. `cos^(-1)(1/3)` b. `cos^(-1)(1/(sqrt(3)))` c. `cos^(-1)(2/(sqrt(3)))` d. none of these

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