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Evaluate (4a+3b)^2-(4a-3b)^2+48ab...

Evaluate` (4a+3b)^2-(4a-3b)^2+48ab`

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For even extension `f(x)=f(-x)`
` :. f(x)=f(-x)={((-x)^(3)+(-x)^(2)",",0le -x le2),(-x+2",",2 lt -x le 4):}`
` ={(-x+2",",-4 le x lt -2),(-x^(3)+x^(2)",",-2lex le0):}`
For odd extension,`f(x)= -f(-x)`
` :. f(x)=-f(-x) ={(x-2",",-4 le x lt -2),(x^(3)-x^(2)",",-2lex le0):}`
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