為玩用
sin - 0 + 2 sino coss + cos'
=>
sing cost =
13
49
13.為銳角,若2sin-cosA=1,則cose =
sino - coso sing + cos² = 1-2x = 1/3
=> (sino-colb)= 35
45
0
(sin 0-cos) 4 sin² 6 - 9 Sin cos 0 + 005' 0 = 12
=7
35in 8-4 sin cos 0 = 0 => Sin (3sing - 4 coso) = 0
14.0為銳角,sin 8+sin2 = 1,求
1
1
+
1+sin 0
1-sin
-- (3sin0) = (4006)
9 (1-0058) = 160059
sino cos ==
=> 25 005 A
:
cos.0.
44
:
1
25
15.設0°<<90°,若tan +
sin-cos =
tane
12
16.設為銳角,已知sin =
2
5
13
0
,
試求tan-
==
2
。
()sin 30°)²+(cos 52° + cos 38°)² + (cos 52°-cos 38°)² =