Tuesday, 17 August 2021

The polynomial x4+4x+c=0 has at least one real root if and only if (a) c<2; (b) c≤2; (c) 3>c (d) c≤3.
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Define f:R→R by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...