Find an equation in rectangular coordinates for the equation given in spherical coordinates. 
Definitions:
Cost Savings
Reductions in expenditures achieved through methods such as negotiation, effciency improvements, or substitution.
Pretax Return
The profit earned by a business before the deduction of tax expenses.
Net Present Value
A financial metric that calculates the difference between the present value of cash inflows and the present value of cash outflows over a period of time.
Net Present Value
A calculation that determines the present value of a series of future cash flows, minus the initial investment, used to assess the profitability of investments.
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