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Calculus1 15 Online
OpenStudy (anonymous):

Plot (use technology) y = sin x+cos x restricted to 0 leq x leq pi/2. Locate the points on the graph at which the tangent line appears to have slope zero. Then solve f'(x) = 0 where x in (0, [pi]/2). This way you find x, for which the graph y = sin x+cos x has a horizontal tangent line

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