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Asked by Peter

Establish the identity

tanx/2=cscx-cotx
15 years ago

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Answered by drwls
cscx - 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
15 years ago
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Establish the identity

tanx/2=cscx-cotx

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