This question is concerned with differentiating the function

f$($x$,$y$)=7$x$311$x$3$y$4+3$y$9(,)=731134+39$

$($a$)$

Find $$f$$x$$

Do not include the $"$f$$x$=="$

Leave any numbers, which are not whole numbers as FRACTIONS. Do not approximate by decimals.

$(5$ marks$)$

This question accepts numbers or formulas.

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$($b$)$

Find $$f$$y$$

Do not include the $"$f$$y$=="$

Leave any numbers, which are not whole numbers as FRACTIONS. Do not approximate by decimals.

$(5$ marks$)$

This question accepts numbers or formulas.

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$($c$)$

Find $2$f$$x$222$

Do not include the $"2$f$$x$222"$

Leave any numbers, which are not whole numbers as FRACTIONS. Do not approximate by decimals.

$(5$ marks$)$

This question accepts numbers or formulas.

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$($d$)$

Find $2$f$$y$222$

Do not include the $"2$f$$y$222"$

Leave any numbers, which are not whole numbers as FRACTIONS. Do not approximate by decimals.

$(5$ marks$)$

This question accepts numbers or formulas.

Plot $|$ Help $|$ Switch to Equation Editor $|$ Preview

$($e$)$

Find $2$f$$x$$y$2$

Do not include the $"2$f$$x$$y$2"$

Leave any numbers, which are not whole numbers as FRACTIONS. Do not approximate by decimals