#C,114#

Insufficient reputation to comment, but further to Squeamish Offisrage's C answer, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.

C,114

Insufficient reputation to comment, but further to Squeamish Offisrage's C answer, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.

#C,114#

Insufficient reputation to comment, but further to Squeamish Offisrage's C answer, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.

#C,114#

Insufficient reputation to comment, but further to Squeamish Offisrage's C answer, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.

C, 114
This should have been a comment

Further to the C answer above, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.

#C,114#

Insufficient reputation to comment, but further to Squeamish Offisrage's C answer, 7 byte reduction by using float for double and removing spaces, and combining declaration and init of 'r' gives

float s,c,r=1,x;main(i,n){for(scanf("%f%d",&x,&n);i<n*2;s+=r,r*=-x/i++)c+=r,r*=x/i++;printf("%.8f\n%.8f\n",s,c);}

try here.