Let â and b̂ be two unit vectors such that |â - b̂|² = 2. If 2θ is the angle between â and b̂, then which one of the following is correct ? - NDA Mathematics 2022 (I)

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Let â and b̂ be two unit vectors such that |â – b̂|² = 2. If 2θ is the angle between â and b̂, then which one of the following is correct ?