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The plane x+2y+3z=7 is rotated about th...

The plane `x+2y+3z=7` is rotated about the line where it cut `y z` -plane by an angle `theta` . In the new position the plane contains the point `(-1,0,2)dot` Then `theta` a.`cos^(-1)1/7` b. `cos^(-1)6/7` c. `cos^(-1)(5/7)` d. `pi/2`

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