1. If $f:x\longrightarrow cos(x)$ is a function, then $f(\pi)$ =

2. If $f(x) = tan^{-1} x$ and $g(x) = tan(x)$, then $(g\circ f)(x)$ =

3. $tanh^{-1}x$ =

4. If $f:X\longrightarrow Y$ is a function, then $y \in Y$ is called

5. tan$270^\circ - \theta$ =

6. $\frac{1 - tan\theta tan\phi}{1 + tan\theta tan\phi}$ =

7. sin$(180^\circ + \theta)$ =

8. cos$(180^\circ + \theta)$ =

9. If $\alpha$, $\beta$, and $\gamma$ are the angles of a triangle ABC, then sin$(\alpha + \beta)$ =

10. $\frac{cos\alpha - sin\alpha}{cos\alpha + sin\alpha}$