<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def derivative(self, x):
 """Derivative of the reduction operator. Parameters x : `domain` element The point to take the derivative in. Returns ------- derivative : linear `BroadcastOperator` Examples -------- Example with linear operator (derivative is itself) rn(3).element([ 9., 14., 19.]) rn(3).element([ 9., 14., 19.]) Example with affine operator Calling operator gives offset by [3, 3, 3] rn(3).element([ 6., 11., 16.]) Derivative of affine operator does not have this offset rn(3).element([ 9., 14., 19.]) """

        return ReductionOperator(*[op.derivative(xi)
                                   for op, xi in zip(self.operators, x)])