Bài 3: MỘT SỐ DẠNG PHƯƠNG TRÌNH LƯỢNG GIÁC ĐƠN GIẢN
[Pages:6]B?i 3: MT S DNG PHNG TR?NH LNG GI?C N GIN
1. Phng tr?nh bc nht v? bc hai i vi mt h?m s lng gi?c:
Phng ph?p: Ta chn mt biu thc lng gi?c th?ch hp c? mt trong
phng tr?nh l?m n ph v? quy v phng tr?nh bc nht hoc bc hai i vi
n ph ? (c? th n?u hoc kh?ng n?u k? hiu n ph).
a) Phng tr?nh bc nht i vi mt h?m s lng gi?c:
V? d 1: Gii c?c phng tr?nh sau:
a) 3tan2x + 3 = 0 b) cos(x + 30?) + 2cos!15? = 1
Gii
c) 3tan2x + 3 = 0 tan2x = "# tan2x = -3 tan2x = tan (- %)
#
#
2 = - 3 + = - 6 + 2
a) cos(x + 30?) + 2cos!15? = 1
cos(x + 30?) = 1 - 2cos!15? cos(x + 30?) = cos150?
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