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### How to get sin(x)

We know sin(x)=x-x^3/3!+x^5/5!-x^7/7!+... . So we can use the way to write a c project.

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### Error!

There is a mistake when I fix my website. I forgot to backup my server key.So I can't use SSL server now.Maybe I can fix it next month.

### Hello World!

#include<stdio.h>
int main(void){
printf("Hello World!\n");
return 0;
}