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Discussion :: Trigonometry

  1.  For Cosine Rule of any triangle ABC, a² is equal to

    2. A.

    b² + a² - 2ac cos A
    B.

    b² + c² - 2bc cos A
    C.

    b² - c² + 3bc cos C
    D.

    b³ + c³ - 2bc cos B

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    Answer : Option B

    Explanation :

    b² + c² - 2bc cos A

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