Prove the identity. 2 sin 20 cos 20+ cos 40=1-sin 40 To verify the identity, work each side separately until you obtain the same expression. Start with the left side. Choose the correct step and transform the expression according to the step chosen. 2 sin ²0 cos ²0 + cos 40 = Now apply an identity to just the expression in the parentheses The part of the expression in parentheses simplifies to Continue the proof. 2 sin 20 cos 20+ cos 40 = a way that will further the proof of the identity. Apply a 1-sin ¹0 identity.

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