Show that . Thanks in advance.
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Hi =) Originally Posted by Air Show that . Thanks in advance. I'd suggest you do this way : Then, use the appropriate formulae : ------------------- Or you can start from And expand while substituting :
Originally Posted by Air Show that . Thanks in advance. Some smooth approaches have already been given. Here's yet another approach (but only if you're familiar with complex numbers):
Originally Posted by Air Show that . Thanks in advance. For FP3, use De Moivre's Theorem. Now binomial theorem gives But you know that and so on Considering only the real part of the expansion Consider (sorry I ran out of time there, working should be easy)
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