mathematics怎样计算极限limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],x -> -infinity]；想求极限,is incomplete; more input is needed.”怎么回事?

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mathematics怎样计算极限limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],x -> -infinity]；想求极限,is incomplete; more input is needed.”怎么回事?
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mathematics怎样计算极限limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],x -> -infinity]；想求极限,is incomplete; more input is needed.”怎么回事?
mathematics怎样计算极限
limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],
x -> -infinity]；
想求极限,is incomplete; more input is needed.”怎么回事?

mathematics怎样计算极限limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],x -> -infinity]；想求极限,is incomplete; more input is needed.”怎么回事?
limit[[sqrt[4 + 1/x - 1/x^2] - 1 + 1/x]/sqrt[1 + sin[x]/x^2],
x -> -infinity] ；
Syntax::sntxb: Expression cannot begin with "[sqrt[4+1/x-1/x^2]-1+1/x]/sqrt[1+sin[x]/x^2]".
Syntax::tsntxi: "[sqrt[4+1/x-1/x^2]-1+1/x]" is incomplete; more input is needed.
Syntax::sntxi: Incomplete expression; more input is needed.

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