Cosine: Cosine (cos 𝑥) is another trigonometric function related to sine. It represents the ratio between adjacent side length and hypotenuse length in right triangles.
Periodicity: Sin 𝑥 is a periodic function, meaning it repeats itself at regular intervals. The period of sin 𝑥 is 2π.
Amplitude: In the context of sine, amplitude refers to the maximum distance between the graph and its midline (y=0). For sin 𝑥, the amplitude is always 1.