(15m^2+11n)^2-(15m^2-11n)^2
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we know , a^2 - b^2 = (a+b)(a-b)
so, (15m^2+11n)^2-(15m^2-11n)^2
= (15m^2+11n + 15m^2-11n)(15m^2+11n - 15m^2+11n)
= (30m^2) (22n)
= 660 m^2.n
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