高中ko講義數學(一)
方程式5sinx＝x有多少個實根？ ... ＝2cos ( 2x－ ) 因0 ≤ x ≤π，故－ ≤ 2x－ ≤ (1) 當2x－＝0，即x＝ 時，f (x) 有最大值2 (2) 當2x－＝π，即x＝ 時，f (x) 有最小值－2. 7. 設f (x)＝cosx ( sinx－cosx ) 且0 ≤ x ≤π，試求f (x) 之最大值，又此時x值為何？ ... ................
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