10th Class Mathematics Introduction to Trigonometry Question Bank Trigonometry

  • question_answer
    The value of \[cos25{}^\circ \cos 20{}^\circ +\sin 25{}^\circ \sin 20{}^\circ \] is

    A) \[\frac{1}{\sqrt{2}}\]

    B) \[2\]

    C) \[cos\,5{}^\circ \]

    D) \[\sin \,5{}^\circ \]

    Correct Answer: C

    Solution :

    Not available


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