Attachment 21064

i tried differentiatin both sides, i did that 4 times and i still couldnt find the pattern that gets me to sin (Worried) any idea how to solve this ??(Thinking)

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- Mar 6th 2011, 04:12 AMPeaceSoulproving an inequality
Attachment 21064

i tried differentiatin both sides, i did that 4 times and i still couldnt find the pattern that gets me to sin (Worried) any idea how to solve this ??(Thinking)

- Mar 6th 2011, 06:37 AMgirdav
Did you compute and ?

- Mar 6th 2011, 10:46 AMTheCoffeeMachine
- Mar 6th 2011, 10:47 AMPeaceSoul
yes i did that, but i got no where,,please guide me im really lost :S

- Mar 6th 2011, 02:18 PMTheCoffeeMachine
.

Denote the stuff under the brackets by . Now, let , then we have:

Recall that (De Moivre's theorem), then:

Thus , therefore . - Mar 6th 2011, 02:44 PMPeaceSoul
Thank you for an amazinggggggggggggg answer !!!!!! You rock