Let M be the set of all functions f(x, y) twice-differentiable in both
x and y, defined on the unit disk D = {(x, y)|x^2 + y^2 < 1}, and such that on the
boundary circle θ ∈ [0, 2π):
f(x = cos θ, y = sin θ) = cos(2θ), 0 ≤ θ < 2π.
Find the function h ∈ M which minimizes the integral
I[f] = double integral absolute value gradient f squared
double integral||∇*(f)||^2
dA,
which means that h ∈ M and
I[h] ≤ I[f], ∀f ∈ M.

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