Предмет: Алгебра, автор: tema220382

найдите cosa,если sina = корень из 7 делённый на 4 и a (0; 0,5п)

Ответы

Автор ответа: dashka9510

sin^2 а + cos^2 а = 1(основное тригонометрическое тождество)

cosa = корень из 1 - sin^2 а

знак не меняем, т.к. угол находится в первой четверти

cos a = корень из ( 1 - 7/16) = корень из 9/16 = 3/4.

ответ cos a = 3/4

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