(Los 2 + 1-cós 2"))+ (cosy*xx-cosy ") + (cosb"* (~-cos. *) .….…..
+ (cos 8x + cos 92/2005/80
2
0+ cos88²-1-cos88) + (-1)=-1
Cos 176 = -cos 4°.
Cos 114 = - cos 6°
cos9v² = - 00588⁰
(2) ( sin l + sin ³ 5 9 ) + (siniz²+ sin 388°) +
...*.*+ (sin 179 + sin 181) + sin360" = 0
得分攻略當場練
(+) ( ) ( )
設1、2、3、4分別為第一、二、三、四象限角,且都介於0與2元 之間.
3
4
已知|cos |=|cos 62|=|cos6g|=|coséal=,請選出正確的選項(多選)
(1) 0,<45°
2√2
(2) 0₁ +0,- 180° (13)900,- - - - 2/2 1500-1
6
(4) sin =
cos3=
(5) 0 = 0 3+90°
2
4
3
3
圖:2345.
