This is the chapter expansion. please give the correct answer.plz.......fasttttttt.....
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(3x-1/3x) ²- (3x+1/3x) (3x-1/3x)
= 9x²+1/9x² -2 *3x* 1/3x -(9x² -1/9x²)
=
=9x²+1/9x² -2 -9x²+1/9x²
=2/9x² -2
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