Let \(S\) be the set of all twice differentiable functions \(f\) from \(R\) to \(R\) such that \.... VIDEO
Let \(S\) be the set of all twice differentiable functions \(f\) from \(R\) to \(R\) such that \(\frac{d^2 f}{d x^2}(x)>0\) for all \(x \in(-1,1)\). For \(f \in S\), let \(X_f\) be the number of points \(x \in(-1,1)\) for which \(f(x)=x\). Then which of the following statements is(are) true? 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live
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