## Trigonometry (10th Edition)

1.$\sec\theta=\frac{r}{x}$ If secant is positive, that means x must be positive (since r is always positive) That can be only I and IV quadrants 2.$\csc\theta=\frac{r}{y}$ If cosecant is positive, that means y must be positive (since r is always poitive) That can be only I and II quadrants 3. For both secant and cosecant to be positive, we must be in Quadrant I