For the Cosine Rule of any triangle ABC, the c² is equal to

1.	For the Cosine Rule of any triangle ABC, the c² is equal to
A.	c² + a² + 2ac cos C
B.	a² + b² - 2ab cos C
C.	a² + b² + 2ab cos A
D.	a² - b² + 2ab sin A
Answer» C. a² + b² + 2ab cos A

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