Mathematics
Senior High
数IIの三角関数の単元です。黄色線のところの書き換え？というかなぜ＝で繋がれる？のかがわかりません。
BB. PD = 2 sin ( 47 - 0) x 2 cos (4-0)
TC
4cos (0+ # ) Sin (0 + 5)
A
=
= 2 sin (20+ I^)
2cos 26
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