माना f(x), R में चर द्विअवकालनीय फलन एक ...

माना f(x), R में चर द्विअवकालनीय फलन एक प्रकार है कि `f(2+x)=f(2-x)` तथा `f'((1)/(2))=f'(1)=0` है , तो अंतराल ( 0 , 4) में समीकरण `f'' ( x ) = 0` के मूलों की न्यूनतम संख्या है

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