8th Class Mathematics Introduction to Trigonometry Question Bank Trigonometry

  • question_answer In the given figure what is the value of\[\mathbf{3sin}\theta +\mathbf{4cos}\theta \]?

    A)  3                                

    B)  4              

    C)  5 

    D)  1

    Correct Answer: C

    Solution :

    (c) \[AC=\sqrt{{{3}^{2}}+{{4}^{2}}}=5\] \[\therefore 3sin\theta +4cos\theta \] \[=3\times \frac{3}{5}+4\times \frac{4}{5}\] \[=\frac{9}{5}+\frac{16}{5}=\frac{25}{5}=5\]

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