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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.
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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