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  5. Introduction to Trigonometry

10th Class Mathematics Introduction to Trigonometry Question Bank Trigonometry

  • question_answer
    If \[sec\,\,\theta +tan\,\,\theta =m\] and \[sec\text{ }\theta -tan\text{ }\theta =n\] then what is the value of mn?

    A)  0                                

    B)  1     

    C)  2                                

    D)  3

    Correct Answer: B

    Solution :

    (b): \[mn=(sec\theta +tan\theta )(sec\theta -tan\theta )\] \[=se{{c}^{2}}\theta -{{\tan }^{2}}\theta =1\]      


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