Trigonometric functions are mathematical functions used to describe relationships between angles and sides of a triangle. The solutions for the term TRIGONOMETRIC FUNCTION are SINH (4 letters), SINE (4 letters), SECANT (6 letters), COSINE (6 letters), TANGENT (7 letters), and TANH (4 letters). SINE and COSINE are the two most commonly used trigonometric functions, and they are used to calculate the ratio of the length of the side of a triangle to the length of its hypotenuse. SECANT is the reciprocal of COSINE, and TANGENT is the ratio of the length of the side of a triangle to the length of its opposite side. Sinh and tanh are hyperbolic functions, which are related to the trigonometric functions but are used to describe curves instead of triangles.