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प्रश्न
Choose the correct alternative:
If `vec"a"` and `vec"b"` are two vectors of magnitude 2 and inclined at an angle 60°, then the angle between `vec"a"` and `vec"a" + vec"b"` is
पर्याय
30°
60°
45°
90°
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उत्तर
30°
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