(a-3b)cube+(a+3b)cube
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a cube_ 3b cube_3×a×3b ( a_3b) + a cube+3b cube+3×a×3b (a+3b)
= a cube_27b cube_ 9a square b _27ab square+a cube+ 27b cube + 9a square b +27ab square
=a cube+ a cube _ 27b cube +27b cube_ 9a square b + 9a square b _27ab square+ 27ab square = 2a cube
= a cube_27b cube_ 9a square b _27ab square+a cube+ 27b cube + 9a square b +27ab square
=a cube+ a cube _ 27b cube +27b cube_ 9a square b + 9a square b _27ab square+ 27ab square = 2a cube
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