Answer:
The current that produces maximum power is 3A
Step-by-step explanation:
Given

Required [Missing from the question]
The current that produces maximum power
First, we represent the function in standard form


Open bracket


The maximum value of c is:

Where:

By comparison: 



So, we have:




Here is the answer for prove that cos theta by 1 minus tan theta + sin theta by 1 minus cot theta equal to sin theta + cos theta