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Given that bar a and bar b are two unit...

Given that `bar a and bar b` are two unit vectors such that angle between `bar a and bar b` is `cos^-1(1/4)`. If `bar c` be a vector in the plane of `bar a and bar b`, such that `|vec c| = 4, vec c xx vec b= 2vec a xx vec b and vec c=lambda vec a+mu bar b` then, find

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