*2.4 三角函數的導數

弧度制

6.2 有向角及其度量 | 基礎數學xu-shi-min.gitbook.io

16個特殊角

https://www.geogebra.org/m/rugteqxp

兩個重要的極限

limit Divide[sin(h),h] as h->0 - Wolfram|AlphaWolfram_Alpha

limit Divide[cos(h)-1,h] as h->0 - Wolfram|AlphaWolfram_Alpha

例3

https://www.geogebra.org/m/pqRAPRnS

例4 計算

D[cos(x),{x,27}] - Wolfram|AlphaWolfram_Alpha

例5 繪圖，計算

plot Divide[sin(7x),4x],Divide[sinx,x] - Wolfram|AlphaWolfram_Alpha

lim Divide[sin(7x),4x] as x->0 - Wolfram|AlphaWolfram_Alpha