cos2分之x的导数是啥，有知道的没 cos²x导数是多少
cos\uff082\u5206\u4e4bx\uff09\u7684\u5bfc\u6570\u7b49\u4e8e\u51e0[cos\uff082\u5206\u4e4bx\uff09]
=-sin(x/2)\u00d7(x/2)'
=-1/2sin(x/2)
cos²x\u5bfc\u6570\u662f-2cosx*sinx
\u9996\u5148\u9700\u8981\u5229\u7528\u5bfc\u6570\u5e38\u7528\u516c\u5f0f\u4e2d\u7684
1.\uff08u*v\uff09\u2018=u\u2019v+uv\u2018\u516c\u5f0f
2.\u53ef\u4ee5\u7406\u89e3\u4e3af(x)=cosx*cosx ,
3.\u4ee3\u5165\u516c\u5f0f\u5f97\u51fa f(x)=cosx'*cosx+cosx*cosx'=-sinx*cosx-sinx*cosx,
4.\u53ef\u4ee5\u5f97\u51faf(x)=-2sinx*cosx
\u6269\u5c55\u8d44\u6599:1.y=c(c\u4e3a\u5e38\u6570),y'=0
2.y=x^n,y'=nx^(n-1\uff09
3.y=a^x,y'=lna*a^x;y=e^x,y'=e^x
4.y=logax(a\u4e3a\u5e95\u6570\uff0cx\u4e3a\u771f\u6570); y'=1/(x*lna);y=lnx,y'=1/x
5.y=sinx y'=cosx
6.y=cosx y'=-sinx
7.y=tanx y'=1/\uff08cos\uff08x\uff09\uff09^2
8.y=cotx y'=-1/sin^2x
9.y=arcsinx y'=1/\u221a\uff081-x^2\uff09
10.y=u^v ==> y'=v' * u^v * lnu + u' * u^(v-1\uff09 * v
=-sinx/2(x/2)'
=-1/2sin(x/2)
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