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  3. 10th Class
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  5. Introduction to Trigonometry

10th Class Mathematics Introduction to Trigonometry Question Bank Introduction to Trigonometery

  • question_answer
    If\[x=3\cos A\cos B,y=3\cos A\sin B\]and \[\text{z}=\text{3 sin A}\], find the value of \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}\].

    A)  3                                            

    B)  6   

    C)  12                         

    D)         9

    Correct Answer: D

    Solution :

     \[\text{192 }=\text{ 24 }\times \text{ 8 }+\text{ }0\]\[{{6}^{x}}\]and \[{{6}^{x}}={{(2\times 3)}^{x}}={{2}^{x}}\times {{3}^{x}}\] \[\Rightarrow \]               \[{{6}^{x}}\] \[\therefore \]


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