Architecture
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a^2 = b^2 + c^2 - 2*b*c*cos(A)
b^2 = c^2 + a^2 - 2*c*a*cos(B)
c^2 = a^2 + b^2 - 2*a*b*cos(C)

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a = (b^2 + c^2 - 2*b*c*cos(A))

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a = (b^2 + c^2 - 2*b*c*cos(A))
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