# include stdio.h # include math.hint main ({ doublex,a,b,I,j,d; i=1; a=1; b=1; printf(x (输入x的值); scanf('%lf ',x ); do{ b=1; for(j=1; j=2*i; j ) {b=b*1/j; (d=a; a=apow(-1,I ) pow ) x,2*i ) b; i=i 1; }while(FABS(a-d ) 0.000001 ); printf(%lf(n ),a ); printf('%lf ',cos ) ) x ); }