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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-9

  • question_answer
    If \[\sin x+{{\sin }^{2}}x=1,\] then the value of\[{{\cos }^{2}}x+{{\cos }^{4}}x\]is

    A)  1                    

    B)  2

    C)  0                    

    D)  None of these

    Correct Answer: A

    Solution :

    As, \[\sin x+si{{n}^{2}}x=1\] \[\sin x=1-{{\sin }^{2}}x={{\cos }^{2}}x\] \[\therefore \]\[{{\cos }^{2}}x+{{\cos }^{4}}x=\sin x+{{\sin }^{2}}x=1\]


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