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If the vertices of a triangle are A( 1, 4, 2 ) , B( - 2, 1, 2 ) and C( 2, - 3, 4...
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If the vertices of a triangle are A( 1, 4, 2 ) , B( - 2, 1, 2 ) and C( 2, - 3, 4), then the angle B is equal to
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