Question

найдите множество значений функции y=4cosx+3

Answer 1

 y=4cosx+3
-1≤cosx≤1
-1*4≤4cosx≤1*4
-4≤4cosx≤4
-4+3≤4cosx+3≤4+3
-1≤4cosx+3≤7

D(y)=[-1; 7]