пожалуйста средний род окончание на я отвечает на вопрос оно или моё три слова

1)найти промежутки возрастания и убывания функции

f(x)=ln x-2x^2

2)найти наибольшее и наименьшее значение функции на промежутке [0;4] f(x)=8+6x-1/2x^3

1)2cos2 x – 11sin 2x = 12

2)2sin2 x – 3sin 2x – 4cos 2x =4

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