i tried differentiatin both sides, i did that 4 times and i still couldnt find the pattern that gets me to sin any idea how to solve this ??
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Did you compute and ?
I think we are using the same book! The last exercise of Chapter IX, right? Originally Posted by PeaceSoul i tried differentiatin both sides, i did that 4 times and i still couldnt find the pattern that gets me to sin any idea how to solve this ? Show that . I avoid the differentiation mess by using the following formula: .
yes i did that, but i got no where,,please guide me im really lost :S
. Denote the stuff under the brackets by . Now, let , then we have: Recall that (De Moivre's theorem), then: Thus , therefore .
Last edited by TheCoffeeMachine; Mar 6th 2011 at 03:32 PM.
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