Mathematics
Senior High
黄色の線から線でcosθの－が消えたのはどうしてですか？
NNNNSNNNSS んのAフレト2/
sin29 Tain49 =2sin のcos 2 デー =2sin39cos(-の .
0 い SS
・ =2Sin 3のcosの
SpN NON NsNボ
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