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Cosine Sum Identity cos(A + B) = cosAcosB - sinAsinB Example 3.5 ...

and cos 2A = cosAcosA - sinAsinA = cos2 A - sin2 A. Double-Angle Identities for Sine and Cosine sin 2A = 2 sinAcosA cos 2A = cos2 A - sin2 A ... Simplify: sin)2 ...



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