Final answer:
Without access to Sedra's microelectronics 5th edition problem 2.70 and the specifics of the circuit, it is not possible to calculate the input bias current (IB).
Step-by-step explanation:
The question relates to finding the input bias current (IB) for a circuit problem from Sedra's microelectronics book. To determine the input bias current (IB), relevant details and equations from the textbook would be required. Without the explicit content of problem 2.70 or the specific characteristics of the circuit mentioned in Sedra's microelectronics 5th edition, it is not possible to accurately calculate the input bias current (IB). Students typically find this information within the course textbook or supplemental materials provided by their instructor.