conditional identities in trigonometry

conditional identities in trigonometry are usually based on A,B, C being angles of a triangle or A + B +C = π

examples

If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

explanation of If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

If A+B+C=π, prove that: sinA+sinB+sinC = cot(A/2).cot(B/2) [sinA+sinB-sinC]

explanation





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