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The law of cosines is a² + b² - 2abcosC = c². find the value of 2abcosC

The law of cosines is a² + b² - 2abcosC = c². find the value of 2abcosC
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The law of cosines is a² + b² - 2abcosC = c². find the value of 2abcosC

User OmegaNalphA
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\bf a^2+b^2-(2ab)cos(C)=c^2\implies a^2+b^2-c^2=(2ab)cos(C)
User Jlb
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