How must the proof be rearranged for the steps to logically follow each other?

Steps 2 and 3 must be switched.

Step-by-step explanation:

Let . From Trigonometry we know the following identity:

(Eq. 1)

Where and are angles measured in radians.

Now we proceed to demonstrate the required steps to expand and simplify given expression:

1) Given.

2)  (Step 1)

3) Trigonometric identity. (Step 3)

4) Distributive property/(Step 2)

5) //Result. (Step 4)

In a nutshell, steps 2 and 3 must be switched.

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