1.

If A, B and C are angles of a triangle, then the determinant ∣∣∣∣−1cos Ccos Bcos C−1cos Acos Bcos A−1∣∣∣∣ is equal to (a) 0 (b) -1 (c) 1 (d) None of these

Answer»

If A, B and C are angles of a triangle, then the determinant

1cos Ccos Bcos C1cos Acos Bcos A1
is equal to

(a) 0
(b) -1
(c) 1
(d) None of these



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