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In order to determine which two angles are complementary, we need to find two angles whose sum is equal to 90° (since complementary angles add up to 90°).
Looking at the given angle measures, the angles that have the sum of 90° are ∠2 (90°) and ∠3 (30°). Therefore, these two angles, ∠2 and ∠3, are complementary.
So the answer is: smaller ∠3 and larger ∠2.