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#1 Re: Help Me ! » Son asked for help with trig identities.. can't seem to remember how » 2006-01-26 01:04:32

Old_dad

Thanks to all.

I keep asking him if he needs any help ... did not actually think he would take me up on it....
It really makes me feel old.

#2 Help Me ! » Son asked for help with trig identities.. can't seem to remember how » 2006-01-25 15:16:01

Old_dad
Replies: 7

Can seem to remember how to prove the following identity

    tanx                sinx
-----------  =   ---------------
1 + tanx         sin x + cosx


I can get

sinx
---------
cosx
---------------
cosx + sinx
-------------
   cosx

but cannot get any further.

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