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Question
Expand `("x"-2/"x")^2`
Sum
Solution
It is known that (a + b)2 = a2 + 2ab + b2 and (a − b)2 = a2 − 2ab + b2.
`("x"-2/"x")^2`
= `("x")^2-2xx("x")xx(2/"x")+(2/"x")^2`
= `"x"^2-4+4/"x"^2`
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