Ответ: cosA = 3/4 .
Объяснение:
sinA =√7/4 ; cosA = √( 1 - sin²A ) = √( 1 - (√7/4 )² ) = √( 1 - 7/16 ) =
= √( 9/16 ) = 3/4 ; cosA = 3/4 .
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Ответ: cosA = 3/4 .
Объяснение:
sinA =√7/4 ; cosA = √( 1 - sin²A ) = √( 1 - (√7/4 )² ) = √( 1 - 7/16 ) =
= √( 9/16 ) = 3/4 ; cosA = 3/4 .