Sunday 15 August 2021

Let \(a,b,c,d>0\), be any real numbers. Then the maximum possible value of \(cx+dy\), over all points on the ellipse \(\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\) must be

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Define \(f: \mathbb{R} \rightarrow \mathbb{R}\) by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \\ 0, &a...