Find the maximum value of the function f(x,y)=2x^3+3y^2-4x-5 on the domain x^2+y^2=121. List the points where the function attains its maximum as an ordered pair.

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Q: (b) Use the function to find T(30,000). $ (c) Find the tax due on a taxable income of $120,000.

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A: ∫01cos22xsin2xdx