MATLAB画不出该图像：代码如下：syms tf1=heaviside(t+1)-heavisid

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这是在7.1.上求的结果：F =2*w/(w+10*pi)/(w-10*pi)*sin(w)
MATLAB画不出该图像：代码如下：syms tf1=heaviside(t+1)-heaviside(t-1)f2=cos(10*pi*t)f3=f1*f2F=fourier(f3)ezplot(F,[-10 10])(图1)
这是在2011b上求的结果：F = - (sin(w)*i)/(pi*10*i - w*i) + (sin(w)*i)/(pi*10*i + w*i)
MATLAB画不出该图像：代码如下：syms tf1=heaviside(t+1)-heaviside(t-1)f2=cos(10*pi*t)f3=f1*f2F=fourier(f3)ezplot(F,[-10 10])(图2)syms wF = - (sin(w)*i)/(pi*10*i - w*i) + (sin(w)*i)/(pi*10*i + w*i)F1 = simple(F)F1 = -(2*w*sin(w))/(- w^2 + 100*pi^2)结果对不对?