Answer
Day 3: Cos 33
Day 4: x = 15
Step by step explanation:
Day 3: These two angles (33 and 57) are complementary angles because they add up to 90.
Day 4:
Recall : if sin x = cos y, then x + y are complementary,
that is x + y = 90
Since sin (2x+7) = Cos (4x-7), then (2x+7) and (4x-7) are complementary, that is:
2x + 7 + 4x - 7 = 90
6x = 90
x = 90/6
x = 15