Prove that . Thanks in advance.
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Hi ! Originally Posted by Air Prove that . Thanks in advance. Then, replace x by , and simplify, using this formula : ------------- or : ---> But So
Last edited by Moo; Jun 18th 2008 at 12:53 PM. Reason: edited
Originally Posted by Moo How did you know that the formula equals -1 or is it just a standard answer?
Originally Posted by Air How did you know that the formula equals -1 or is it just a standard answer? That's because and You should know that Or just know the formula : which can be found in several signatures in this forum (Chris L T521, kalagota, ... ?)
So... I did: I can simplify but what about ?
Originally Posted by Air So... I did: I can simplify but what about ? hehe, that's the way (little mistake in red) << I used the rule : And be careful ^^
Hello Originally Posted by Moo [...] [...] "Little mistake in red."
Originally Posted by flyingsquirrel Hello "Little mistake in red." I forgot that
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