4x Find the linearization L(x.y) of the function f(x,y) = e cos (5y) at the points (0,0) and 0,- The linearization at (0,0) is L(x,y) =| (Type an exact answer, using t as needed.) The linearization at 0,5 is L(x.y) = (Type an exact answer, using n as needed.)

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