=sinbucosts, cos60 sin45°
2
12
=
√3
2 2
=
13-12-16-12
2√2 2√2 2√√ z XVZ
16-12
4
4
(3) cos 165°
= Cos(60°+105)
607
√
45°イ
=
=cos60℃os105°-sin6sin105
=xCDS (60°+45°xsin(60°+45)
2
11x(cos60°cos45°-sin60°sin45゜)-
x(sin6fcos 45°+cost sin45°)
=(x/xx/+////)
2
2
2
412
(
(3)
412
-2-23XV2-22-216-12-16
4V2 XV
4
9
サ