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: B0

Each term is (tan A - tan B), (tan B - tan C), and (tan C - tan A). Their sum is 0.

Share this question

More from Trigonometry