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

  • question_answer
    If\[\Delta \text{ABC}\]is right angled at C, find the value of\[\cos (A+B)\].

    A)  0                            

    B)         1    

    C)  \[\frac{1}{2}\]                                  

    D)         \[\frac{\sqrt{3}}{2}\]

    Correct Answer: A

    Solution :

     \[\text{1}0\text{4}=\text{16}\times \text{6}+\text{8}\] \[16=8\times 2+0\]         [ Since\[\text{256}=\text{8}\times \text{32}+0\]] \[3465={{3}^{2}}\times 5\times 7\times 11\]\[\text{546}0=\text{22}\times \text{3}\times \text{5}\times \text{7}\times \text{l3}\]


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