# include stdio.h # include math.hint main () { int i=0,j=1,n; double x; double a,result=0.0,b; scanf('%d%lf )、n和x ); wile(I=n ) b=1; for(intk=1; k=j; k ) {b=b*k; }a=pow(-1,I ) ) pow ) x,j )/b; result=result a; I; j=j 2; }printf('%lf(n ),result ); printf('%lf ',sin ) x ); //验证返回0; 东方(o )