Find the inverse function of f. 
Definitions:
Collar
An options strategy that brackets the value of a portfolio between two bounds.
Net Outlay
The total amount invested or spent, minus any returns or reimbursements.
Options Strategy
A plan or approach for trading options that can involve buying and/or selling one or more options that differ in one or more of the options' variables.
Security
A financial instrument that represents an ownership position in a publicly-traded corporation (stock), a creditor relationship with a governmental body or a corporation (bond), or rights to ownership as represented by an option.
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