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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-11

  • question_answer
    If \[cos\,\text{(}A-B)=3/5\]and tan A tan B = 2, then which of the following is true?

    A)  \[sun\,(A+B)=\frac{1}{5}\]

    B)  \[sun\,(A+B)=-\frac{1}{5}\]

    C)  \[Cos\,\,(A-B)=\frac{1}{5}\]

    D)         \[Cos\,\,(A+B)=-\frac{1}{5}\]

    Correct Answer: D

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