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If veca and vecb are two non collinear u...

If `veca` and `vecb` are two non collinear unit vectors and `iveca+vecbi=sqrt(3)` then find the value of `(veca-vecb).(2veca+vecb)`

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`alpha, beta` must satisfy `cos^(2)alpha+cos^(2)beta+cos^(2)gamma=1`
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