The angle betwene the line vecr=(1+2mu)h...

The angle betwene the line `vecr=(1+2mu)hati+(2+mu)hatj+(2m-1)hatk` and the plane `3x-2y=6z=0` where `mu` is a scalar is (A) `sin^-1(15/21)` (B) `cos^-1(16/21)` (C) `sin^-1(16/21)` (D) `pi/2`

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