a3 + b3 - a (a - b) + b (a + b)2
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a^3+2b^3-a^2+ab+a^2b+2ab^2
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for the sequence of regular polygons starting with an equilateral triangle,write the algebraic expressions for the sequence of the sums of inner angles,the sums of the outer angles,the measures of an inner angle,and the measures of an outer angles?
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