A.  cos 7θ-7cos 5θ+21cos 3θ+35cos θ

B.  cos 7θ-7cos 5θ-21cos 3θ-35cos θ

C.  cos 7θ-7cos 5θ+21cos 3θ-35cos θ

D.  cos 7θ+7cos 5θ+21cos 3θ+35cos θ

1
Correct Answer :
cos 7θ+7cos 5θ+21cos 3θ+35cos θ
Explanation :
No Explanation available for this question

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