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  3. 10th Class
  4. Mathematics
  5. Introduction to Trigonometry

10th Class Mathematics Introduction to Trigonometry Question Bank MCQs - Introduction to Trigonometry

  • question_answer
    If \[\sin A=\frac{4}{5},\] then \[1-2{{\sin }^{2}}A=\]

    A) \[1-2{{\cos }^{2}}A\]

    B) \[{{\cos }^{2}}A-{{\sin }^{2}}A\]

    C) \[2{{\sin }^{2}}A+1\]

    D) \[{{\sin }^{2}}A-{{\cos }^{2}}A\]

    Correct Answer: B

    Solution :

    [b] \[1-2{{\sin }^{2}}A={{\sin }^{2}}A+{{\cos }^{2}}A-2{{\sin }^{2}}A={{\cos }^{2}}A-{{\sin }^{2}}A\]


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