Chapter 2 - Acute Angles and Right Triangles - Section 2.3 Finding Trigonometric Function Values Using a Calculator - 2.3 Exercises - Page 63: 3

Reciprocals: tangent, cosine and sine functions

1. Cotangent is the reciprocal of tangent $\frac{1}{\cot \theta} = \tan \theta$ 2. Secant is the reciprocal of cosine $\frac{1}{\sec \theta} =\cos \theta$ 3. Cosecant is the reciprocal of sine $\frac{1}{\csc\theta} = \sin \theta$