Conditional Identities
Conditional Identities Some standard Identities in Triangle: 1. sin2A + sin2B + sin2C = 4 sinA sinB sinC Proof: L.H.S sin2A + sin2B + sin2C (since sinC + sinD = 2sin (C + D)/2 cos (C – D)/2), , , , , , , , , , , , Hence proved 2. cosA + cosB Read more about Conditional Identities[…]