Trigonometryhard · Past Paper
If sin A + sin B + sin C = 4 cos(A/2) cos(B/2) cos(C/2), then A+B+C is:
A90
B180
C270
D360
✓ Correct Answer: B — 180
This is the standard identity for the sum of sines of angles in a triangle.
Share this question
✓ Correct Answer: B — 180
This is the standard identity for the sum of sines of angles in a triangle.
Share this question