62) Let f be a continuous function that can be expressed in polar coordinates as a function of θ only; that is, f(x,y)=h(θ), where \((x,y) \in D = \big\{(r, \theta)\,|\,R_1 \le...62) Let f be a continuous function that can be expressed in polar coordinates as a function of θ only; that is, f(x,y)=h(θ), where (x,y)∈D={(r,θ)|R1≤r≤R2,θ1≤θ≤θ2}, with 0≤R1<R2 and 0≤θ1<θ2≤2π.
