需要知识: ( x n ) ′ n x n − 1 (x^n)nx^{n-1} (xn)′nxn−1 ( s i n x ) ′ c o s x (sinx)cosx (sinx)′cosx [ f ( g ( x ) ) ] ′ f ′ ( g ( x ) ) g ′ ( x ) [f(g(x))]f(g(x))\times g(x) [f(g(x))]′f′(g(x))g′(x)
推完之后,考虑导函数与x轴的交点…
转自:http://blog.sina.com.cn/s/blog_4a033b090100pwjq.html
求导公式(撇号为转置):
Y A * X --> DY/DX A Y X * A --> DY/DX A Y A * X * B --> DY/DX A * B Y A * X * B --> DY/DX B * A
乘积的导数
d(f*g)/dx(df…