Let us find values for cos x within the interval [0, pi]:

x=0 ==> Cos0 = 1

x= pi/2 = 3.14/2 = 1.57 ==> cospi/2 = 0

x= pi = 3.14 ==> cos pi= -1

Then we notice that the function is decreasin for the interval [0,pi]

==> cos3 < cos2 < cos 1

Then arranging increasingly would be:

cos3 cos2 cos1 (cos 1 is the largest and cos 3 is the smallest)

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