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  5. Introduction to Trigonometry

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

  • question_answer
    \[{{\cot }^{2}}30{}^\circ +\cos ec30{}^\circ +3{{\tan }^{2}}30{}^\circ \]is equal to

    A) 3

    B) 1

    C) 0

    D) 6

    Correct Answer: D

    Solution :

    We have, \[{{\cot }^{2}}30{}^\circ +\cos ec30{}^\circ +3{{\tan }^{2}}30{}^\circ \] \[={{\left( \sqrt{3} \right)}^{2}}+\left( 2 \right)+3{{\left( \frac{1}{\sqrt{3}} \right)}^{2}}\] \[=3+2+3\times \frac{1}{3}=6\]


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