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11th Class Mathematics Sample Paper Maths Olympiad Model Paper-4

  • question_answer
    The function \[f(x)={{\sin }^{4}}x+{{\cos }^{4}}x\] increases, if:

    A)  \[0<\times <\frac{\pi }{8}\]                  

    B)  \[\frac{\pi }{4}<\times <\frac{3\pi }{8}\]

    C)  \[\frac{3\pi }{8}<\times <\frac{5\pi }{8}\]                     

    D)  \[\frac{5\pi }{8}<\times <\frac{3\pi }{4}\]

    E)  None of these

    Correct Answer: B

    Solution :

     Not Available


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