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Question

Find $$(l + m)^2 -(l -m)^2$$.


A
4lm
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B
2lm
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C
0
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D
1
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Solution

The correct option is A $$4lm$$
  we can use the identity $$(a^2-b^2)=(a+b)(a-b)$$
$$i.e (l+m+l-m)(l+m-l+m)=2l\times 2m=4lm$$

Mathematics

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