Posted by
**Mary** on
.

With figure,

img19.imageshack.us/img19/2135/81gd.png

prove:

tan(x/2) = sin(x)/(1+cos(x)).

Sunday

March 26, 2017
Posted by
**Mary** on
.

With figure,

img19.imageshack.us/img19/2135/81gd.png

prove:

tan(x/2) = sin(x)/(1+cos(x)).

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