Предмет: Алгебра, автор: DatexEnglish

Чему равен cos а, если sin а=0,6 и пи/2 < a < пи

Ответы

Автор ответа: MAXIS95
0
cosa=sqrt(1-sin^2(a))=0.8
Но так как это вторая четверть, то -0.8
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