Final answer:
The value of y = cos(θ) when θ = 0° is 1.
Step-by-step explanation:
The value of y = cos(θ) when θ = 0° is 1.
The cosine function is a trigonometric function that gives the ratio of the length of the adjacent side to the hypotenuse in a right triangle. When the angle θ is 0°, the adjacent side and the hypotenuse have the same length, resulting in a ratio of 1. Therefore, the value of cos(0°) = 1.