Can you prove the trig identities given A + B + C = 180 degrees?

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Given:
A + B + C = 180 degrees

Prove:
TanA + TanB + TanC = TanA x TanB x TanC
First time submitting something. Thank you all.
 
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Hint: what do you know about 3 angles that sum to 180 degrees?
 
You need to show some attempt.
 
Start proving from the LHS.
 

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