[問題] 三角函數
sin(pi/7)xsin(2*pi/7)xsin(3*pi/7)=?
和差化積
兩倍角公式
三倍角公式
一直算不出來
請板上各位大大幫忙了 Orz
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推
08/26 20:00, , 1F
08/26 20:00, 1F
→
08/26 20:06, , 2F
08/26 20:06, 2F
推
08/26 20:54, , 3F
08/26 20:54, 3F
→
08/26 21:00, , 4F
08/26 21:00, 4F
→
08/26 21:02, , 5F
08/26 21:02, 5F
推
08/26 21:05, , 6F
08/26 21:05, 6F
推
08/26 22:55, , 7F
08/26 22:55, 7F
→
08/26 22:59, , 8F
08/26 22:59, 8F
→
08/26 23:00, , 9F
08/26 23:00, 9F
→
08/27 01:20, , 10F
08/27 01:20, 10F
推
08/27 01:49, , 11F
08/27 01:49, 11F
→
08/27 19:26, , 12F
08/27 19:26, 12F
推
08/27 19:30, , 13F
08/27 19:30, 13F
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