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Mathematics
Senior High
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高二數學求詳解

例題 10二倍角公式綜合應用 如右圖,△ OAB、△OBC 、 △ OCD 都是直角三角形,∠AOB=15°, ∠BOC=15°,∠COD=30°,OD=12,試求AB長。(10分) 解 Cos 30° = 53 sin 30° 2 ' 2 sin 450 cos 450 A 2 cos (45°-30°) 12 √2 √3 JBtJ2 4 sin (45°-30°) = 56-J2 高中數學(3)A・習作 4 365 42 x (JL +52) 952 +356 D 12 65350 <30° 15° B 15° A
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