Question:
(l m)² - (l m)
Answer:
Given, (l + m)² - (l + m)
= (l + m)*(l + m - 1) [take common (l + m)]
So, (l + m)² - (l + m) = (l + m)*(l + m - 1)
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Given, (l + m)² - (l + m)
= (l + m)*(l + m - 1) [take common (l + m)]
So, (l + m)² - (l + m) = (l + m)*(l + m - 1)