difference in authors solution and matlab solution

This is question of book of signal Processing first by Yoder and Schafer

The author has drawn spectrum which is different than spectrum of matlab. why there is difference. Is author solution wrong

the author solution is here

http://www.4shared.com/photo/TtXsfCA1/question.html

and matlab code for spectrum is here

Fs = 2000;
t = 0:1/Fs:1-(1/Fs);
x = cos(80*pi*t-pi/3).*(cos(1200*pi*t+pi/4));
xdft = (1/length(x))*fft(x);
freq = -1000:(Fs/length(x)):1000-(Fs/length(x));
plot(freq,abs(fftshift(xdft)));

Answer 1

[moonman]

ok problem resolved

the author was wrong

he did not write

2*pi*f*t