1 1 3
у'=----------- *---------*3=-----------------------
2√tg3x cos²3x 2(√tg3x)(cos²3x)
2x^y-3ху^-6xy+3xy^=2x^y-6xy
^ это квадрат
1/(a²-ac-ab+bc) + 2/( b²-ab-bc+ac) + 1/(c²-ac-bc+ab) = 1/(a(a-c) + b(c-a)) + 2/(b(b-a) + c(a-b)) + 1/(c(c-a) + b(a-c)) = 1/(a-b)(a-c) + 2/(a-b)(c-b) + 1/(a-c)(b-c) = 1/(a-b)(a-c) + 2/(a-b)(c-b) - 1/(a-c)(c-b) = ((c-b) + 2(a-c) - (a-b))/(a-b)(a-c)(c-b) = (c-b + 2a - 2c - a + b)/(a-b)(a-c)(c-b) = (a-c)/(a-b)(a-c)(c-b) = 1/(a-b)(c-b)
.............................
2х - х + 3х - х = 4 + 2 - 5
3х = 1
х = 1/3