def is_trivial(self) -> bool:
        """Returns True iff each controlled variable is activated only for value 1.

        This configuration is equivalent to `cirq.SumOfProducts(((1,) * num_controls))`
        and `cirq.ProductOfSums(((1,),) * num_controls)`
        """
Returns True iff each controlled variable is activated only for value 1.

        This configuration is equivalent to `cirq.SumOfProducts(((1,) * num_controls))`
        and `cirq.ProductOfSums(((1,),) * num_controls)`
        
cirq-core/cirq/ops/control_values.py