( 7ab/ 2b^2 - 3 )^2 =
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( 7ab/ 2b^2 - 3 )^2 =
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( 7ab/ 2b^2 - 3 )^2
= (7ab)^2
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(2b^2 - 3)^2
= 49 a^2 b^2
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(2b^2 - 3)(2b^2 - 3)
= 49 a^2 b^2
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4b^4 - 6b^2 - 6b^2 + 9
= 49 a^2 b^2
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4b^4 - 12b^2 + 9