Trigonometryhard · Past Paper
Simplify: sin(A-B)/cos A cos B + sin(B-C)/cos B cos C + sin(C-A)/cos C cos A.
A1
B0
Ctan A tan B tan C
Dsin A + sin B + sin C
✓ Correct Answer: B — 0
Each term is (tan A - tan B), (tan B - tan C), and (tan C - tan A). Their sum is 0.
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