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elnemiwar
@elnemiwar
August 2022
1
6
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Помогите!15 баллов!
Объясните как это делать,меня не было...не могу понять теперь
Sin 315=?
cos 7П/3=?
tg(-4П/3)=?
ctg(29П/2)=?
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sedinalana
Verified answer
Sin 315=sin(360-45)=-sin45=-√2/2
sin(360-a)=-sina
tg(-4П/3)=-tg4π/3=-tg(π+π/3)=-tgπ/3=-√3
tg(π+a)=-tga
cos 7П/3=cos(2π+π/3)=cosπ/3=1/2
cos(2π+a)=cosa
ctg(29П/2)=ctg(14π+π/2)=ctgπ/2=0
ctg(π+a)=ctga
3 votes
Thanks 7
elnemiwar
Объясните,пожалуйста...
sedinalana
правило?
sedinalana
Это формулы приведения
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Answers & Comments
Verified answer
Sin 315=sin(360-45)=-sin45=-√2/2sin(360-a)=-sina
tg(-4П/3)=-tg4π/3=-tg(π+π/3)=-tgπ/3=-√3
tg(π+a)=-tga
cos 7П/3=cos(2π+π/3)=cosπ/3=1/2
cos(2π+a)=cosa
ctg(29П/2)=ctg(14π+π/2)=ctgπ/2=0
ctg(π+a)=ctga