Grade 12Algebra
If A+B+C = 180 then cos3A + cos3B + cos3C
If A+B+C = 180 then cos3A + cos3B + cos3C
1 Answer
Shreshth graak
Cos3A+cos3B+cos3C
2[cos3(A+B)/2]cos3(A-B)/2 + cos3C
-2[sin3c/2]cos3(a-b)/2 + 1-sin²3c/2
1-2sin3c/2[cos3(a-b)/2 - sin3c/2
After solving this u git answer
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