第11章 11.8

(1)

$\sin 450° = \sin 90° = 1$

(2)

$\sin(-765°) = \sin(-45°) = -\frac{1}{\sqrt{2}}$

(3)

$\cos 2130° = \cos 330° = \frac{\sqrt{3}}{2}$

(4)

$\cos(-120°) = -\frac{1}{2}$

(5)

$\tan 420° = \tan 60° = \sqrt{3}$

(6)

$\tan(-225°) = -1$