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Unit vector barc is inclined at an angle theta to unit vector bara times barb which are perpendicular . IF c=lamda(bara +barb)+mu(bara times barb),lamda,mu real then theta belongs to

Answer»

`(-PI/4,0)`
`[0,pi/4]`
`((3PI)/4,pi)`
`[pi/4,(3pi)/4]`

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