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    Question

    In ∆ABC, AB = 5cm, BC = 6cm and AC = 10cm then find

    out the value of cos A?
    A 73/100 Correct Answer Incorrect Answer
    B 65/100 Correct Answer Incorrect Answer
    C 89/100 Correct Answer Incorrect Answer
    D 92/100 Correct Answer Incorrect Answer

    Solution

    cos A = (b2+c2 - a2)/2bc = (102+52-62)/(2×10×5) = 89/100

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