Mathematics
Senior High
この問題の意味が分かりません。また波戦のやつもどっから出てきましたか？
例題 0°≦0<360° のとき, 4cos20-4sin0-1=0 を解け。
4cos20-4sin0-1=0
4(1-sin20)-4sin0-1=0
-4sin20-4sin0+3=0
4sin20+4sin0-3=0
(2sin+1)(2sin0-3)=0
13
... sine=
-
2'2
0°0 360°より
-1≤sino≤1
... sine=
2
(sino=1/2/3は不適)
..0=210°, 330°
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