Posted by **Sam** on Wednesday, November 6, 2013 at 5:21pm.

Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C.

I tried drawing perpendiculars and stuff but it doesn't seem to work?

For me, the trig identities don't seem to plug in as well.

Help is appreciated, thanks.

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