About a formula

Hi Rene

I am trying to plot a formula which is

S = 3/2 * [ 0.703 * (Sin(x)/1.414)^2 + 0.297 * ((1-Cos(x))/2)^2 + ((1+Cos(x))/2)^2 ].

I have tried to use the

root[]TF1 f1("polarization","(3/2)*(0.703*(sin(x)/(1.414)^2))+(3/2)*(0.297*((((1-cos(x))/2)^2)))+(3/2)*(((1+cos(x))/2)^2)",-1,1);

root[] f1->Draw();

The final limit -1 and 1 are related to Cos(x).

When I Draw this function it does not gives the exact result. I have attached the exact result in the attached file with the name "picture1"

please check is whether it is implemented correctly or there is some mistake.

regards
Irfan