Mathematics
Senior High
ここの問題で
何故最後の答えがマイナスじゃなくて
プラスになって
左真ん中にマイナスがつくのですか？
4
cos165°=cos(120°+ 45°)
=Cos120°cos 45° - sin120° sin45°
V3
2
V2
2
2
VZ +V6
4
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