Question

@phi

Answer 1

Identify the maximum and minimum values of the function y=3cosx in the interval [-2pi,2pi].

Answer 2

have you ever seen a plot of cosine ?

Answer 3

For example, see
http://hotmath.com/hotmath_help/topics/graphing-cosine-function.html

Answer 4

yess

Answer 5

for just cos(x) , what is the max value ? you can see the answer in the graph.

Answer 6

1

Answer 7

and if you multiply that max value by 3 what do you get ?

Answer 8

3

Answer 9

and it's the same idea for the minimum value of 3 cos(x)

Answer 10

which would be -3

Answer 11

yes

Answer 12

i have to like show work for this problem, but there isnt really much to show

Answer 13

its really easy

Answer 14

you can write: max value of cosine in the interval [-2pi,2pi] is 1
3 cos(x) has a max value of 3 * max value of cosine = 3*1= 3

Answer 15

gotcha, thanks!