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निम्नलिखित अंतरालों मैं से किस अंतराल मे...

निम्नलिखित अंतरालों मैं से किस अंतराल में `f(x)=x^100+sinx-1` द्वारा प्रदत फलन f निरंतर ह्रासमान है?
`(A)(0,1)`
`(B)(pi/2,pi)`
`(C) (0,pi/2)`
`(D)` इनमे से कोई नहीं

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