## Trigonometry (10th Edition)

1. x is negative y is negative r is always positive 2. $\sin\theta=\frac{y}{r}=\frac{-}{+}=-$ $\cos\theta=\frac{x}{r}=\frac{-}{+}=-$ $\tan\theta=\frac{y}{x}=\frac{-}{-}=+$ 3. The other three trig functions will have the same signs because they are just reciprocal