英语翻译if f'(x) is not zero,the point is a non-stationary point of inflection.如何翻译?

英语翻译if f'(x) is not zero,the point is a non-stationary point of inflection.如何翻译? f(x)=x^2,and if h is not zero,then f(x+h)-f(x)/h=?美国的数学题, 求一个数学和英文都不错的能人,求解以下这几题.看不懂的就打酱油吧.Determine whether or not F is a conservative vector field.If it is,find a function f such that F = f.If it is not,enter NONE.F（x,y)=(exp(x) sin(y) i+ (exp( 英语翻译I'm not sure if it is good or not ___ ___ ___ 英语翻译请翻译：Of what good is democracy if it is not for the poor? 英文原版：For any polynomial f,f(a)=0 if and only if (x-a) is a factor of f(x).Please explain it in a PHYSICAL way(not in a mathematical way).大致翻译：对于任意的多项式函数f,当且仅当（x-a）是f（x）的一个因式,f(a)=0. 英语翻译Thd purchase order is not vadid if nobody fills in the spproval blank 英语翻译What good is having it if I'm not taking time to enjoy it? 英语翻译The result is a comparable,if not an improved,controller for the scanning monochromator. for x >= o f(x)= x2-x how is f defined for x < 0 if (a) f is even (b) f is odd 英语翻译if love does not know how to give and take withou restriction it is not love but a transaction 英语翻译If love something,set it free;If it come back,it is yours,if it does not ,it never was 英语翻译：What if not the driver? if it is not me什么意思 英语翻译could u tell me if there is anyone who do not think u r the cutest?if there is,she or he must be ccrazy. 英语翻译it is generally no longer considered a male trait if such clothing is not worn by girls and women.if怎么弄啊? 英语翻译If words of command are not clear and distinct,if orders are not thoroughly understood,the general is to blame.But if his orders are clear,and the soldiers nevertheless disobey,then it is the fault of their officers. 英语翻译but if you think it is not convinent at this moment,it is OK for me not to visit you.