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Q25Section A (Section A)25 of 60

Differentiability at zero of two oscillating functions

Let

f(x)={xsin⁡2(1/x),x≠0, 0,x=0,andg(x)={x(sin⁡x)sin⁡(1/x),x≠0, 0,x=0.f(x)=\begin{cases}x\sin^2(1/x), & x\ne0,\ 0, & x=0,\end{cases}\quad\text{and}\quad g(x)=\begin{cases}x(\sin x)\sin(1/x), & x\ne0,\ 0, & x=0.\end{cases}

Then

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