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Let bar(a) and bar(c) are two vectors su...

Let `bar(a)` and `bar(c)` are two vectors such that `|bar(a)|=(|bar(c)|)/(2)=1` and angle between `bar(a)` and `bar(c)` is `30^(@)` then one of the angles of the triangle having `bar(a),bar(a)times(bar(a)times bar(c))` as its sides, is

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