factorize a^2/16+b^2/4+1-ab/4-b+a/2
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25(a+b)^2 - 16(a-b)^2
=> [ 5(a+b)]^2 - [ 4(a-b)]^2
=> (5a +5b)^2 - (4a-4b)^2
=> (5a +5b - 4a +4b) ( 5a +5b +4a - 4b)
=> (a +9b) (9a+b)
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