$$( c ) ( - \frac { 2 } { 3 } ) ^ { 4 }$$
$\frac{16}{81} = 0.19753086419753085$
$$\frac{\mathrm{d}}{\mathrm{d}c}(c\times \frac{16}{81})$$
$$\frac{16}{81}c^{1-1}$$
$$\frac{16}{81}c^{0}$$
$$\frac{16}{81}\times 1$$
$$\frac{16}{81}$$
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$\frac{16c}{81}$
$$c\times \frac{16}{81}$$
