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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 45

  • question_answer
    If\[co{{s}^{-1}}\left( cosx \right)=\sqrt{1+sin2x}\forall \,x\in (0,2\pi )\], then no. of solution =

    A) 2                     

    B)        4     

    C) 3                     

    D)        5

    Correct Answer: A

    Solution :

    [a] \[\sqrt{1+sin2x}=\left| sinx+cosx \right|\] \[=\sqrt{2}=\left| sin\left( x+\frac{\pi }{4} \right) \right|\]


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