Consider the function f(x)=sin(2x)-2sin(x) ,where x[-π,π].f(x) has 3 points
of inflection and their x coordinates are given by _________.
The directional derivative of f(x,y,z)=x^2+yz at (1,-3,2) in the direction
of the path r(t)=t^2i+3tj+(1-t^3)k is_________.
這題的方向導數我會求，不過加上後面那句我不懂是什麼意思? 沒見過這種題目@@
The value of the infinite series Σn=1→∞ n/(n+1)! is _________.
這幾題不會@@
拜託大家救救我@@
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