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Discussion :: Trigonometry

  1.  For Cosine Rule of any triangle ABC, b² is equal to

    2. A.

    a² - c² 4bc cos A
    B.

    a² + c² - 2ac cos B
    C.

    a² - c² + 2ab cos A
    D.

    a³ + c³ - 3ab cos A

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    Answer : Option B

    Explanation :

    a² + c² - 2ac cos B

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