Trig Functions

Study Guide: The 6 Trigonometric Functions

1. Sine (sin) y

   • Definition: Opposite side divided by hypotenuse in a right triangle.

   • opp/hyp

2. Cosine (cos) x

   • Definition: Adjacent side divided by hypotenuse in a right triangle.

   • adj/hyp

3. Tangent (tan) y/x

   • Definition: Opposite side divided by adjacent side in a right triangle.

   • opp/adj

4. Cosecant (csc) 1/y

   • Definition: Reciprocal of sine.

   • hyp/opp

5. Secant (sec) 1/x

   • Definition: Reciprocal of cosine.

   • hyp/adj

6. Cotangent (cot) x/y

   • Definition: Reciprocal of tangent.

   • adj/opp