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

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

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