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1. |
What is the value of [(cos 3θ + 2cos 5θ + cos 7θ)÷(cos θ + 2cos 3θ + cos 5θ)] + sin 2θ tan 3θ? |
A. | cos 2θ |
B. | sin 2θ |
C. | tan 2θ |
D. | cot θ sin 2θ |
Answer» B. sin 2θ | |