If A + B + C = 180°, Prove that

Sin² (A/2) + sin² (B/2) - sin²(C/2) = 1 – 2cos (A/2) cos (B/2) sin(C/2)

Similar Questions

If A + B + C = 180°, Prove thatSin² (A/2) + sin² (B/2) + sin²(C/2) = 1 – 2sin (A/2) sin (B/2) sin(C/2)
1. 0 answers
If sin(θ) = -1/√2, find sin2(θ). (Recall that sin2(θ) means (sin(θ))2.)sin2(θ) =
1. 1 answer
In a ∆ABC, if ∠C = 90°, prove that sin2 A + sin2 B = 1.
1. 1 answer
What is the first step. Explain please.Which expression is equivalent to cos^2x + cot^2x + sin2^x? a) 2csc^2x b) tan^2x c)
1. 4 answers