The expression that will complete step 2 of the proof is √ 1 + cos(x).
What is a mathematical proof?
A mathematical proof is a step by step explanation of the steps that leads to a particular result. We can see the steps as itemized in the image attached. Usually, a proof involves a series of statements. These statements are expected to arrive at a particular conclusion which shows the statements made to be true or false. They are often employed in geometry.
In order to complete step 2, we need to prove an identity hence the expression is multiplied by 1 and this gives us √ 1 + cos(x).
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