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<response><unit><id>4e324fee-ab2d-4270-bb79-2c2ef1d3d2f5</id><parent_id>5c53e21b-2031-483d-a802-d39720738c65</parent_id><number>4.2.8.10</number><names>[{"lang":"es","name":"Derivada de la composición de funciones (regla de la cadena)"},{"lang":"en","name":"Derivative of the composition of functions (chain rule)"},{"lang":"ca","name":"Derivada de la composició de funcions (regla de la cadena)"}]</names><difficulty>7</difficulty><created>18/7/16 11:43</created><modified>18/7/16 11:43</modified></unit></response>
