Find the sum or difference as a product of sines or cosines

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Reference no: EM1315269

Question: Find the sum or difference as a product of sines or cosines.
cos (6θ) + cos (4θ)

[a] 2 sin (5θ) sin θ
[b] 2 cos (5θ) sin θ
[c] 2 cos (5θ) cos θ
[d] 2 cos (5θ)

Reference no: EM1315269

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