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JEE Main & Advanced Mathematics Trigonometric Identities Question Bank Fundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles

  • question_answer
    The value of \[\tan (-945{}^\circ )\] is [MP PET 1997]

    A) - 1

    B) - 2

    C) - 3

    D) - 4

    Correct Answer: A

    Solution :

    \[\tan (-945{}^\circ )=\tan [-(945{}^\circ )]\] \[=-\tan [(2\times 360{}^\circ +225{}^\circ )]\] \[=-\tan [225{}^\circ ]=-\tan 45{}^\circ =-1\].


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