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kate647
@kate647
August 2022
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cos480°=...;tg(-315°)=;ctg690°=
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подкожного
1)cos480=cos (360+120)=cos120=cos (180-60)= -cos60= -1/2
2)tg (-315)= -tg (360-45)=tg45=1
3)ctg690=ctg (360+330)=ctg330=ctg (360-30)= -ctg30= - квадрат. корень из 3
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kate647
вау ,спасибо большое☺
подкожного
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Answers & Comments
2)tg (-315)= -tg (360-45)=tg45=1
3)ctg690=ctg (360+330)=ctg330=ctg (360-30)= -ctg30= - квадрат. корень из 3