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krissimon009
@krissimon009
July 2022
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Помогите решить:
Найдите cos b, tg b и ctg b, если sin b=4/5(Это дробь)
Геометрия 8 Класс
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Answers & Comments
KimLien2000
Sin²B+cos²B=1
16/25+cos²B=1
cos²B=1-16/25=9/25
cosB=извлекаем корень из дроби 9/25=3/5
tgB=sinB:cosB
tgB=4/5:3/5=4/5*5/3=4/3
ctgB=cosB:sinB=3/4
7 votes
Thanks 15
krissimon009
Спасибо большое))
KimLien2000
Рада помочь.)
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Answers & Comments
16/25+cos²B=1
cos²B=1-16/25=9/25
cosB=извлекаем корень из дроби 9/25=3/5
tgB=sinB:cosB
tgB=4/5:3/5=4/5*5/3=4/3
ctgB=cosB:sinB=3/4