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A parallelogram is constructed on 2bar(a...

A parallelogram is constructed on `2bar(a)+3bar(b)` and `3bar(a)-5bar(b),` where `।bar(a)|=4` and `|bar(b)|=5.` If the angle between `bar(a)` and `bar(b)` is `(pi)/(3),` then the magnitude of the smaller diagonal is

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