сочинить 2 предложения про космос

Помогите решить тригонометрическое уравнение! cos4x + 2sin^2x = 0, если можно с обьяснением 

дуга окружности ас не содержащая точки в составляет 280.а дуга окружности bc,не содержащая точки а,составляет 70 градусов.найдите вписанны угол acb.ответ дайте в градусах.

Пищеварительная система пресмыкающихся. Органы пищеварительной системы в порядке переваривания пищи.

Заранее спасибо!

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