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    5. Find the exact value of cos 120°.

    Question

    Find the exact value of cos

    120°.
    A 1 Correct Answer Incorrect Answer
    C -0.5 Correct Answer Incorrect Answer
    D 0.5 Correct Answer Incorrect Answer

    Solution

    ATQ, cos 120° =  cos(90 + 30) = - Sin 30° =  -(1/2) 0r -0.5

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