1.

What is the value of cos[(180° – θ)/2].cos[(180° – 9θ)/2] + sin[(180° – 3θ)/2].sin[(180° – 13θ)/2]?

A. sin2θ.sin4θ
B. cos2θ.cos6θ
C. sin2θ.sin6θ
D. cos2θ.cos4θ
Answer» C. sin2θ.sin6θ


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