Question 1

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Let us consider the set


A equals open curly brackets z element of complex numbers colon space Re open parentheses fraction numerator negative 4 over denominator z end fraction close parentheses minus Im open parentheses fraction numerator negative 4 over denominator z with bar on top end fraction close parentheses greater-than or slanted equal to negative 5 close curly brackets

and the function f left parenthesis x comma y right parenthesis equals cos open parentheses 4 times x squared close parentheses plus arctan open parentheses negative 4 times x to the power of 5 close parentheses minus x cubed

We can assure that there is a point Error converting from MathML to accessible text. where the function reaches a greater value that any else in the domain A
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