Question: Find the sumS = cos(2x) + cos(4x) + cos(6x) + ... + cos(2nx),where n is a positive integer. Express your answer as a product and

Find the sumS = cos(2x) + cos(4x) + cos(6x) + ...

+ cos(2nx),where n is a positive integer. Express your answer as a

Find the sumS = cos(2x) + cos(4x) + cos(6x) + ... + cos(2nx),where n is a positive integer. Express your answer as a product and quotient of trigonometric functions.

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