## Trigonometry (10th Edition)

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 $\frac{1}{\csc\theta} = \sin \theta$