A $C^1$ nonincreasing cutoff $\varphi:\mathbb{R}\to[0,1]$ equal to $1$ on $(-\infty,1/4]$ and to $0$ on $[3/4,\infty)$

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A $C^1$ nonincreasing cutoff $\varphi:\mathbb{R}\to[0,1]$ equal to $1$ on $(-\infty,1/4]$ and to $0$ on $[3/4,\infty)$ · Prove2Me