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December 22, 2014

December 22, 2014

Posted by **Peter** on Thursday, April 15, 2010 at 5:10am.

tanx/2=cscx-cotx

- Pre Calculus -
**drwls**, Thursday, April 15, 2010 at 5:21amcscx - cotx = (1 - cosx)/sinx

That is the standard formula for tan x/2.

For a proof of that, see

http://oakroadsystems.com/twt/double.htm#TanHalf

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