If A+B+C = 180, then sin^2 A + sin^2 B - sin^2 C = ? – Trigonometry

Trigonometryhard · Past Paper

If A+B+C = 180, then sin^2 A + sin^2 B - sin^2 C = ?

A2 sin A sin B cos C

B2 cos A cos B sin C

C1 - 2 sin A sin B cos C

✓ Correct Answer: A — 2 sin A sin B cos C

Standard conditional identity for sine squares in a triangle.

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