Ответ:
Объяснение:
cos^2 a = √1-sin^2a = √ 1 - 9/25 =√ 25/25-9/25 =√16/25 = 4/5
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Ответ:
Объяснение:
cos^2 a = √1-sin^2a = √ 1 - 9/25 =√ 25/25-9/25 =√16/25 = 4/5