Answer:
d = -1
Step-by-step explanation:
Step 1: Define
f(x) = sin(x - 90°)
f(0) is x = -
Step 2: Substitute and Evaluate
f(0) = sin(0° - 90°)
f(0) = sin(-90°)
We know from the unit circle that -90° is equal to 270° or 3pi/2. The value of 3pi/2 is (0, -1). sin is always y, so our answer is -1.
