Ответ:
Объяснение:
cos a =√ 1- sin^2a = √ 1 - 1/9 =√9/9 - 1/9 =√8/9= √8/√9 = 2√2/3
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Ответ:
Объяснение:
cos a =√ 1- sin^2a = √ 1 - 1/9 =√9/9 - 1/9 =√8/9= √8/√9 = 2√2/3