Предмет: Алгебра, автор: most210517

Знайдіть значення виразу sinx×cosx,якщо sinx+cosx=a

Ответы

Автор ответа: anuapolina08

Відповідь:

sinx·cosx

sinx+cosx = a

Виразимо з даного рівняння sinx:

sinx = a - cosx тепер, підставимо це у перший вираз:

(a-cosx)cosx = acosx - cos²x.

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