Uses crt; var n,i: integer; x,s: real; function pow(x: real; n: integer): real; var r: real; i: integer; begin r: =x; for i: =1 to n-1 do r: =r*x; pow: =r; end; begin clrscr; write('n: '); readln(n); write('x: '); readln(x); for i: =1 to n do s: =s+pow(sin(x),i); writeln('answer: ',s: 5: 4); readln; end.