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Preheat oven to 375°. In a large bowl, beat the butter, oil and sugars. Beat in eggs until well blended. Beat in vanilla. Combine the flour, baking soda and cream of tartar; gradually add to creamed mixture., Drop by small teaspoonfuls onto ungreased baking sheets. Bake until lightly browned, 8-10 minutes. Remove to wire racks to cool.