How do you prove the identity $tan^2x/(secx+1)= (1-cosx)/cosx$ ?

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Answer 1 · 2015-02-07T13:29:49

You can change:
$tan(x)$ into $sin(x)/cos(x)$ and
$sec(x)$ into $1/cos(x)$
Giving:
enter image source here

hope it helps

How do you prove the identity tan^2x/(secx+1)= (1-cosx)/cosxtan^2x/(secx+1)= (1-cosx)/cosx?