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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.

**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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