The correct answers is c^2 = a^2 + b^2 - 2ab.cos(C) , Option(C).
What are laws of cosines?
The cosine of one of a triangle's angles is related to the lengths of its sides by the Law of cosines.
The three formulae for Laws of cosines:
a^2 = b^2 + c^2 - 2bc.cos(A)
b^2 = a^2 + c^2 - 2ac.cos(B)
c^2 = a^2 + b^2 - 2ab.cos(C)
Hence, according to the formulae, The correct answer is c^2 = a^2 + b^2 - 2ab.cos(C), Option(C).
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