सिद्ध कीजिए कि \( (-1,1) \) में \( f(x)=x^{2}-x+1 \) से प्रदत्त फलन न तो वृद्धिमान है और न ही ह्...

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सिद्ध कीजिए कि \( (-1,1) \) में \( f(x)=x^{2}-x+1 \)
से प्रदत्त फलन न तो वृद्धिमान है और न ही ह्रासमान है।
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