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प्रश्न
Simplify by using formula :
`("a" + 2/"a" - 1) ("a" - 2/"a" - 1)`
उत्तर
`("a" + 2/"a" - 1) ("a" - 2/"a" - 1)`
= `("a" - 1)^2 - (2/"a")^2`
= `"a"^2 + 1 - 2"a" - (4)/"a"^2`
(Using identity : (a + b)(a - b) = a2 - b2).
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