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#419 [–¼‘O‚È‚µ]
cosX+sinX=ã2{(1/ã2)cosX+1/ã2)sinX}
=ã2{cos(ƒÎ/4)cosX+sin(ƒÎ/4)sinX}
=ã2sin{X+(ƒÎ/4)}

⏰:11/02/13 22:57 📱:SH06B 🆔:gg66/HCI


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