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Re: Trigonometric identitiesPosted by Louis Feng on October 20, 1998 at 23:57:34: In Reply to: Trigonometric identities posted by Janos Koplyay on October 12, 1998 at 17:23:42: Hi Janos, There are ways to do that, One way is write sin 5x as sin(3x+2x), cos 5x as cos(3x+2x), then use the Sum and Difference formulas to expand them. After that we can use Double & Triple Angle formulas to simplify the terms. This is just an idea, Edward have other ways to do it and as well as the sin(n)x formulas. I will post it soon. Hope they will help. Best regards, Louis : Is there a method to find an identity formula forcos(5x), or cos(nx) where n is greater than 2? : Is there a method to find an identity formula forcos(5x), or cos(nx) where n is greater than 2?
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