I need help for my homework, thanks. 1) 2) If A + B + C = 180 degrees, prove that Thank you.
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Hello, elitewarr! For the first one, we need three identities: . . . . . . Start with the left side: . . . . . . . . . . . . . . . . . . . .
OHH!! Never did I ever thought of using sin(a-b).. Haha... Thanks
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