Решение : /////////////////////////////////
(4,5х^3 - 7,5 х)(2х^2 + 3)
9х^5 + 13,5х^3 - 15х^3 - 22,5х
9х^5 - 1,5х^3 - 22,5х
(^ - в степени)
2Cos5x Cosx - Cos5x = 0
Cos5x(2Cosx -1) = 0
Cos5x = 0 или 2Cosx -1 = 0
5x = π/2 + πk , k ∈Z Cosx = 1/2
x = π/10 + πk/5, k ∈Z x = +-arcCos1/2 + 2πn , n ∈Z
x = +-π/3 + 2πn , n ∈Z
a) y²-8y+16; б) 49x²+14xa+a²; в) 25c²-1; г) 9a²-4b²
Производная сложной функции
y ' = (sin3x) ' = cos3x *(3x)' = 3cos3x