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10th Class Mathematics Introduction to Trigonometry Question Bank Trigonometry

  • question_answer
    In given figure what is the value of \[\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}\theta -\mathbf{si}{{\mathbf{n}}^{\mathbf{2}}}\theta \]?

    A) \[\frac{841}{41}\]

    B) 0

    C) 1

    D) \[\frac{41}{841}\]

    Correct Answer: D

    Solution :

    (d): \[AC=\sqrt{{{20}^{2}}+{{21}^{2}}}=\sqrt{841}\] \[=\frac{{{(21)}^{2}}}{841}-\frac{{{(20)}^{2}}}{841}\] \[=\frac{41}{841}\]


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