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Black Book Advanced Problems in MathematicsMathematicsDeterminants

If A, B, C are the angles of triangle ABC, then the minimum value of vmatrix -2 & cos C & cos B cos C & -1 & cos A cos B & cos A & -1 vmatrix is equal to:

Options

  1. A0
  2. B-1
  3. C1
  4. D-2

Correct answer

B. -1

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