<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):
 """Return the operator derivative. The derivative of the operator composition follows the chain rule: ``OperatorComp(left, right).derivative(y) == OperatorComp(left.derivative(right(y)), right.derivative(y))`` Parameters x : `domain` `element-like` Evaluation point of the derivative. Needs to be usable as input for the ``right`` operator. """

        if self.is_linear:
            return self
        else:
            if self.left.is_linear:
                left_deriv = self.left
            else:
                left_deriv = self.left.derivative(self.right(x))

            right_deriv = self.right.derivative(x)

            return OperatorComp(left_deriv, right_deriv,
                                self.__tmp)