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way51
@way51
July 2022
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Помогите пожалуйста, заранее спасибо)))
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au456
Verified answer
Sin a = 2√2cos a
sin^2 a+ cos ^2 a = 1
sin^2 a (1+(1/2√2)^2)=1
sin^2 a=8/9
sin a = 2√2/3
cos a =√2 sin a
cos^2 a (1+(1/√2)^2)=1
cos^2 a = 4/5
cos a = -2/√5. минус потому что в 3 четверти.
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Answers & Comments
Verified answer
Sin a = 2√2cos asin^2 a+ cos ^2 a = 1
sin^2 a (1+(1/2√2)^2)=1
sin^2 a=8/9
sin a = 2√2/3
cos a =√2 sin a
cos^2 a (1+(1/√2)^2)=1
cos^2 a = 4/5
cos a = -2/√5. минус потому что в 3 четверти.