Question

What is the range of the function f(x) = 4 cosx in the interval 0 less than or equal to x less than 2 pi?
Help pleasee

Answer 1

is (-4,4) the right answer?

Answer 2

I have no idea...

Answer 3

in f(x) our only variable is cosx. the maximum and minimum values of f(x) will depend on the corresponding values of cosx
since -1<=cosx<=1 where xbelongf to 0 to 2pi
-4<=f(x)<=4

Answer 4

If you say soo haha. Thankss

Answer 5

u can also come to the same conclusion by using calculus(concept of maxima and minima)