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If A, B, C are angle of a triangle ABC,...

If `A, B, C` are angle of a triangle `ABC`, then the value of the determinant `|(sin (A/2), sin (B/2), sin (C/2)), (sin(A+B+C), sin(B/2), cos(A/2)), (cos((A+B+C)/2), tan(A+B+C), sin (C/2))|` is less than or equal to

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