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2.3.2 初等函数的导数
通过以上的探讨,已经解决了常数和基本初等函数、函数的和、差、积、商、复合函数等的求导问题,也就是初等函数的求导.为了便于熟记和运用,一并总结如下:
1.基本初等函数求导公式
(1)(c)′=0; (2)(xα)′=αxα-1;
(3)(sinx)′=cosx; (4)(cosx)′=-sinx;
(5)(tanx)′=sec2x; (6)(cotx)′=-csc2x;
(7)(secx)′=secx·tanx; (8)(cscx)′=-cscx·cotx;
(9)(ax)′=ax·lna; (10)(ex)′=ex;
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常用的特殊公式:
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2.求导法则
(1)(u±v)′=u′±v′;
(2)(uv)′=u′v+uv′,[cu(x)]′=cu′(x)(c为常数);
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(4)反函数求导法则;
(5)复合函数求导法则y′x=y′u·u′x.
例5 求下列函数的导数.
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