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A vector equation of the line of interse...

A vector equation of the line of intersection of the planes`vec r = vec b +lambda_1(vecb -vec a) +mu_1(vec a + vec c)` `vec r = vec c +lambda_2 (vecb - vecc) +mu_2(vec a +vecb)` and `veca, vecb, vecc` being non coplanar vectors is

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