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Discussion :: Trigonometry

  1.  By expressing cos 82° in terms of trigonometrical ratios, answer will be

    2. A.

    − cos 29° = -0.8746
    B.

    − cos 38° = -0.7880
    C.

    − cos 89° = -0.2319
    D.

    − cos 98° = -0.1392

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    Answer : Option D

    Explanation :

    − cos 98° = -0.1392

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