That’s a 30-60-90 triangle. The hypotenuse is the radius, so it’s 1. That means that the short
leg is and the long leg is :So,28 . C
Combine the equations so as to lose t and get y in terms of x:So you might be tempted by (E), which looks like the graph of y = x^4 . But the stem says that 0
≤ t ≤ 1 , so the only possible values of are 0 ≤ x ≤ 1 , so the correct graph is (C).