Pascal 输入x的值按下列公式计算cos(x).cos(x)=1-x^2/2!+x^4/4!-x^6/6!+...直
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var

x,j,f,c,c0:real;

i:longint;

h:integer;

begin

readln(x);

c:=1;c0:=0;f:=1;

h:=1;i:=0;j:=1;

while abs(c-c0)>1E-6 do begin

c0:=c;

f:=f*sqr(x);

j:=j*(i+1)*(i+2);

i:=i+2;

h:=-h;

c:=c+h*f/j;

end;

writeln(c:10:6);

readln;

end.

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