A 2-column table with 4 rows. Column 1 is labeled Statement with entries cosine (2 x), = cosine (x + x), = cosine (x) cosine (x) minus sine (x) sine (x), = cosine squared (x) minus sine squared (x). Column 2 is labeled Reason with entries Given, 1, 2, 3. The table shows the derivation of cos(2x). Select the correct reason for each step. Reason 1 is . Reason 2 is . Reason 3 is .
