Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Sin x refers to the trigonometric sine function, which relates an angle in a right triangle to the ratio of the length of the side opposite that angle to the length of the hypotenuse.
Related terms
Trigonometric Functions: Mathematical functions that relate angles and sides of triangles.
Cosine (cos) Function: A trigonometric function that relates an angle in a right triangle to the ratio of the length of the adjacent side to the length of the hypotenuse.
Tangent (tan) Function: A trigonometric function that relates an angle in a right triangle to the ratio of the length of the opposite side to the length of the adjacent side.