Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[xd\imath ffd\imath ff,x,\]
Regroup terms.
\[xddfff\imath \imath f,x,\]
Simplify \(xddfff\imath \imath f\) to \(x{d}^{2}{f}^{3}\imath \imath f\).
\[x{d}^{2}{f}^{3}\imath \imath f,x,\]
Use Product Rule: \({x}^{a}{x}^{b}={x}^{a+b}\).
\[x{d}^{2}{f}^{4}{\imath }^{2},x,\]
Use Square Rule: \({i}^{2}=-1\).
\[x{d}^{2}{f}^{4}\times -1\times ,x,\]
Simplify \(x{d}^{2}{f}^{4}\times -1\times \) to \(x{d}^{2}{f}^{4}\).
\[x{d}^{2}{f}^{4},x,\]
x*d^2*f^4,*x,
