## Precalculus (6th Edition) Blitzer

Consider the provided statement, There are three reciprocal trigonometric functions, making a total of six, including sine, cosine and tangent. The reciprocal of the cosine function is: $\frac{1}{\cos \theta }=\sec \theta$ The reciprocal of the sine function is: $\frac{1}{\sin \theta }=\csc \theta$ Hence, the statement does not make sense. The sine and cosine functions are not reciprocals of each other.