Question

sequence {An}={cos(n)/(n)} : is this increasing? decreasing? or neither?

Answer 1

hi

Answer 2

the sequence is some what alternating type ... neither is perhaps better option

Answer 3

this is the alternating type?

Answer 4

http://www.wolframalpha.com/input/?i=ListPlot%5BTable%5BCos%5Bn%5D%2Fn%2C+%7Bn%2C+1%2C+20%7D%5D%5D

Answer 5

what do you call this?

Answer 6

alternating

Answer 7

how did you figure out this will be alternating type by just looking at the equation?

Answer 8

What is the nature of cosine? it will give you all values between -1 ad 1
first goes to +1 then comes back to -1 and goes to +1 ... and so on and on. just check your function first.

Answer 9

oh i got it. so i could figure out by plugging in numbers

Answer 10

tthank you!

Answer 11

yep!! than you can