Math Problem Statement
demuestra que sen a + sen b+ sen c= cos ((a+b-c)/2)+ cos ((a-b+c)/2)+ cos ((-a+b+c)/2)
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Sum and Difference Identities
Sine and Cosine Functions
Formulas
sin(a) + sin(b) + sin(c)
cos((a + b - c) / 2)
cos((a - b + c) / 2)
cos((-a + b + c) / 2)
cos(x + y) = cos(x)cos(y) - sin(x)sin(y)
Theorems
Sum and Difference Formulas
Cosine Symmetry (cos(-x) = cos(x))
Suitable Grade Level
Undergraduate (University Level Trigonometry)
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