第11章 11.2

(1)

$\sin\alpha = 0.1908 \qquad \alpha = 11°$

(2)

$\cos\alpha = 0.8192 \qquad \alpha = 35°$

(3)

$\tan\alpha = 0.8693 \qquad \alpha = 41°$

(4)

$\sin\alpha = 0.8192 \qquad \alpha = 55°$

(5)

$\cos\alpha = 0.1908 \qquad \alpha = 79°$

(6)

$\tan\alpha = 1.1504 \qquad \alpha = 49°$