مشكلة في الدوال المثلثية

#include<stdio.h>
#include<math.h>
#define pi 3.1415926535
main()
{
int n;
float a,b,c,ro,phi,s,r,teta,t,i;
printf("please choise:\n");
printf("1-convert from cartizian to circular.\n");
printf("2-convert from circular to cartizian.\n");
printf("3-convert from cartizian to spherical.\n");
printf("4-convert from spherical to cartizian.\n");
scanf("%d",&n);
if(n==1)
{
printf("please enter Ax,Ay,Az:\n");
scanf("%f%f%f",&a,&b,&c);
ro=sqrt(pow(a,2)+pow(b,2));
s=atan2(b,a);
phi=s*(180/pi);
printf("RO=%f\tPHI=%f\tz=%f\n",ro,phi,c);}
else
if(n==2)
{
printf("please enter phi,Ro,Z:\n");
scanf("%f%f%f",φ,&ro,&c);
a=ro*cos(phi);
b=ro*sin(phi);
printf("AX=%f\tAY=%f\tAZ=%f",a,b,c);}
else
if(n==3)
{
printf("please enter AX,AY,AZ:\n");
scanf("%f%f%f",&a,&b,&c);
r=sqrt(pow(a,2)+pow(b,2)+pow(c,2));
s=atan2(b,a);
phi=s*(180/pi);
i=sqrt(pow(a,2)+pow(b,2));
t=atan2(i,c);
teta=t*(180/pi);
printf("R=%f\tPHI=%f\tTETA=%f\n",r,phi,teta);}
else
if(n==4)
{
printf("please enter R,PHI,TETA:\n");
scanf("%f%f%f",&r,φ,&teta);
a=r*sin(teta)*cos(phi);
b=r*sin(teta)*sin(phi);
c=r*cos(teta);
printf("AX=%f\tAY=%f\tAZ=%f\n",a,b,c);}

}