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10th Class Mathematics Introduction to Trigonometry Question Bank Trigonometry

  • question_answer
    Which of the following is equal to \[2\,\,ta{{n}^{2}}A-2\,\,se{{c}^{2}}A-5\,\,co{{t}^{2}}A+5\,\,\cos e{{c}^{2}}A\]?

    A)  2                                

    B)  3  

    C)  4                                

    D)  5

    Correct Answer: B

    Solution :

    (b): \[2\left( {{\tan }^{2}}A-{{\sec }^{2}}A \right)-5\left( {{\cot }^{2}}A-\cos e{{c}^{2}}A \right)\] \[\Rightarrow \]   \[-2-5(-1)=-2+5=3\]        


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