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由于正、余弦函数是轴对称图形,对称轴是过图象的最值点且垂直于x轴的直线,故就可运用导数来解决.若对称轴为x=x0,则f’(x0)=0.
Since the positive and cosine functions are axisymmetric, the axis of symmetry is the straight line passing through the image at the point of maximum value and perpendicular to the x axis, so the derivative can be used to solve. If the axis of symmetry is x=x0, then f’(x0) =0.