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Unit vector in the xyplane that makes an...

Unit vector in the xyplane that makes and angle of `45^0` with the vector `hati+hatj` and an angle of `60^0` with the vector `3hati-4hatj` is (A) `hati` (B) `(hati+hatj)/sqrt(2)` (C) `(hati-hatj)/sqrt(2)` (D) none of these

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