C^2=a^2+b^2 2ab\cos c

Type your math problem... c^2=a^2+b^2-2ab\cos C

Question

c^{2} = a^{2} + b^{2} - 2 ab cos (C)

Solve the equation

C = ⎩ ⎨ ⎧ arccos (\frac{- c ^{2} + a ^{2} + b ^{2}}{2 ab}) + 2 kπ - arccos (\frac{- c ^{2} + a ^{2} + b ^{2}}{2 ab}) + 2 kπ, k \in Z

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