def _(f=input_box(default=2*cos(x+y),type=SR, label="f(x,y)=",width=40),f1=input_box(default=2*cos(t),type=SR, label="x(t)=", width=40), f2=input_box(default=3*sin(t),type=SR, label="y(t)=", width=40), a =(0, (-10,10)), b=(2*pi,(-10,10))):

    
    
    Evaluate
    

        

            
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