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## Re:无聊的数学题，推导如下

Posted by zhengxiying at 2010-04-28 17:36:38 on Problem 1045
In Reply To:无聊的数学题，推导如下 Posted by:200730690105 at 2008-09-12 14:21:18
```> //公式推导：V2=iR=CR d/dt(Vs*cos(wt)-Vr*cos(wt+b))=Vrcos(wt+b)
> //          CRw(sin(wt+b)-sin(wt))=Vr*cos(wt+b)
> //          令t=0化简得：   tan(b)=1/(CRw)-------------(1)
> //          令wt+b=0化简得：Vr=CRwVs*sin(b)------------(2)
> //          由(1),(2)得：   Vr=CRwVs/sqrt(1+(CRw)^2))
>
> #include <stdio.h>
> #include <math.h>
> int main()
> {
> 	double vs,r,c,w,vr;
> 	int i,t;
> 	scanf("%lf %lf %lf %d",&vs,&r,&c,&t);
> 	for(i=1;i<=t;i++)
> 	{
> 		scanf("%lf",&w);
> 		vr=c*r*w*vs/sqrt(1+c*r*w*c*r*w);
> 		printf("%.3lf\n",vr);
> 	}
> 	return 0;
> }
```

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