Find all relative extrema Use the Second Derivative Test whe

Find all relative extrema. Use the Second Derivative Test where applicable. (If an answer does not exist, enter DNE.)
f(x) = cos x ? 6x, [0, 4?]
relative minimum (x,y)=
relative maximum (x,y)=

Solution

relative minima/maxima exists at those points where df(x)/dx=0 df(x)/dx=-sinx-6=0 so sinx=-6 as sinx has maximum value 1 this equation has no solution so there is no relative maxima/minima relative minimum=DNE relative maximum=DNE
Find all relative extrema. Use the Second Derivative Test where applicable. (If an answer does not exist, enter DNE.) f(x) = cos x ? 6x, [0, 4?] relative minimu

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