[微積] 證明函數比大小
證x-(x^3)/6<sinx for all x>0
我是想說先證0<x<=3pi/2沒實根 所以不是>就是< 然後再帶數字證小於
還是說應該從其他觀念著手
這是大一微積分 目前只教了多項式跟三角函數的微分 還有中間值 均直定理之類的
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