Question 1

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Let F colon real numbers squared rightwards arrow real numbers squared be the function defined by
F left parenthesis x comma y right parenthesis equals open parentheses straight e to the power of x minus 1 end exponent times cos open parentheses y close parentheses comma straight e to the power of x plus 3 end exponent times sin open parentheses y close parentheses close parentheses


Choose the true statement (there may be more than one)
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