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statuscvo [17]
3 years ago
15

CosA+cosB+cosC+cos(A+B+C)= cos(A+B).cos(B+C).cos(C+A)

Mathematics
1 answer:
RoseWind [281]3 years ago
8 0

Answer:

cos (A+B+C)

Step-by-step explanation:

as A,B,C, are triangle we have A,B and C as 180

cost

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