Give the value(s) of x at whichf has either a local minimum or a local maximum. Give the interval(s) where the graph of fis concave up.

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A: L.H.S.:=cos h2x +sin h2x=(cos hx)2 +(sin hx)2  =ex+e-x22+ex-e-x22=14(ex+e-x)2+(ex-e-x)2

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