Review the proof. A 2-column table with 8 rows. Column 1 is labeled step with entries 1, 2, 3, 4, 5, 6, 7, 8. Column 2 is labeled statement with entries cosine squared (startfraction x over 2 endfraction) = startfraction sine (x) + tangent (x) over 2 tangent (x) endfraction, cosine squared (startfraction x over 2 endfraction) = startstartfraction sine (x) + startfraction sine (x) over cosine (x) endfraction overover 2 (startfraction sine (x) over cosine (x) endfraction) endendfraction, cosine squared (startfraction x over 2 endfraction) = startstartfraction startfraction question mark over cosine (x) endfraction overover startfraction 2 sine (x) over cosine (x) endfraction endendfraction, cosine squared (startfraction x over 2 endfraction) = startstartfraction startfraction (sine (x)) (cosine (x) + 1) over cosine (x) endfraction overover startfraction 2 sine (x) over cosine (x) endfraction endendfraction, cosine squared (startfraction x over 2 endfraction) = (startfraction (sine (x) ) (cosine (x) + 1 over cosine (x) endfraction) (startfraction cosine (x) over 2 sine (x) endfraction), cosine squared (startfraction x over 2 endfraction) = startfraction cosine (x) + 1 over 2 endfraction, cosine (startfraction x over 2 endfraction) = plus-or-minus startroot startfraction cosine (x) + 1 over 2 endfraction endroot, cosine (startfraction x over 2 endfraction) = plus-or-minus startroot startfraction 1 + cosine (x) over 2 endfraction endroot. Which expression will complete step 3 in the proof? sin2(x) 2sin(x) 2sin(x)cos(x) sin(x)cos(x) + sin(x).
