when I applied fft to displacement-time data , I cant see maximum displacement value?

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Maximum displacement is 1 , but with fft I can only see 0.9267? Where is my mistake?
t=0:0.01:10;
t_step=0.01;
ts=1/t_step;
x=sin(1.66*t);
figure(1);
plot(t,x);
x =x' .*hann(length(x))*2;
%x=x'.*flattopwin(length(x))*2;
N1=2^nextpow2(length(x));
freq1=(0:1:(N1-1)/2)*ts/N1;
fx1=fft(x,N1)/N1*2;
ffx1=abs(fx1(1:floor(N1/2)));
figure(2);
plot(freq1,ffx1);

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