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

  • question_answer
    \[\sin 2A=2\sin A\]is true when A is:(NCERT EXEMPLAR)

    A) \[0{}^\circ \]

    B) \[30{}^\circ \]

    C) \[45{}^\circ \]

    D) \[60{}^\circ \]

    Correct Answer: A

    Solution :

    [a] \[LHS=\sin 2A=\sin 2\times 0{}^\circ =\sin 0{}^\circ =0\]
    \[RHS=2\sin A=2\sin 0{}^\circ =2\times 0=0\]
    \[\Rightarrow \,\,\,\,\,\,\,\,\,\,A=0{}^\circ \]


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