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加法定理を使いsin195°を求める問題なのですが、なぜマーカー部分はマイナスになるのでしょうか？？
ien20 ge0n
269 (1) sin195° =sin(150° + 45°)nie)X
= sin 150°cos 45° +cos150°sin 45°
1
X
2
V3
V2 t1
1
1
V2
V2-V6
2
203
1-V3
2/2
4
a
tend
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