Answer: Sine (sin) and cosine (cos) are trigonometric functions that you can use with right triangles. The sine of an angle is the opposite side/hypotenuse and the cosine of an angle is the adjacent side/hypotenuse. You can remember these with the acronym SOH CAH TOA.
(Sine opposite hypotenuse, cosine adjacent hypotenuse, tangent opposite adjacent).
Hope this helps! :)
