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    Question

    If ∆ABC is right angled at C, then the value of cos

    (A+B) is
    A 1 Correct Answer Incorrect Answer
    B 1/2 Correct Answer Incorrect Answer
    C √3/2 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    We are given a right-angled triangle △ABC where C=90⁰. Angle Sum Property In any triangle = A+B+C=180⁰ Since C=90 , we get: A+B=90⁰ Find cos(A+B) cos(90)⁰ = 0

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