1.

→a,→b and →c be three vectors having magnitudes 1, 1 and 2 respectively. If →a×(→a×→c)+→b=0 , then the acute angle between →a and →c is

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a,b and c be three vectors having magnitudes 1, 1 and 2 respectively. If a×(a×c)+b=0 , then the acute angle between a and c is




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