Hi, I tried everything I could think of, but I cannot solve this problem. Any idea? (look at the image bellow)

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- Sep 20th 2012, 05:06 AMalireza1992Problem with mathematical induction
Hi, I tried everything I could think of, but I cannot solve this problem. Any idea? (look at the image bellow)

Attachment 24865 - Sep 20th 2012, 05:38 AMemakarovRe: Problem with mathematical induction
In the inductive step, you need to show . Multiply both sides by and use the formula for the difference of cosines.