If a〖cos〗^3 θ+3a〖sin〗^2 θcosθ=m and a〖sin〗^3 θ+3asinθ〖cos〗^2 θ=n prove that 〖m+n)〗^(2/3)+(〖m-n)〗^(2/3) =〖2a〗^(2/3)
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