1.

If A + B + C = π, then sec A (cos B cos C − sin B sin C) is equal to(a) 0(b) −1(c) 1(d) None of these

Answer» If A + B + C = π, then sec A (cos B cos C − sin B sin C) is equal to

(a) 0

(b) −1

(c) 1

(d) None of these


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