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Given that cos""(x)/(2).cos""(x)/(4).cos...

Given that `cos""(x)/(2).cos""(x)/(4).cos""(x)/(8)...=(sin x)/(x)." Then find the sum "(1)/(2^(2))sec^(2)""(x)/(2)+(1)/(2^(4))sec^(2)""(x)/(4)+...`

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