(see attached thumbnail) Where did I go wrong?
Last edited by AaPa; Jul 3rd 2013 at 07:01 PM.
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thank you but please tell me what was wrong in what i did.
there is nothing wrong but you did not start the proof at all. you have just used the condition A + B + C = pi to simplify the expression. the proof starts thereafter. That is why I started from where you left ok.
the given condition was A+B+B=pi I don't understand how i got A+B+C=pi/2
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