We need to determine the biggest value among cos1, cos2, and cos3
Since 1 is in the first quadrant, then the cosine is positive, then cos1? 0
However, 2 belongs to the interval (pi/2, pi) =(3.14/2, 3.14)which is in the 2nd quadrant where the cosine is negative ,
then cos2<0
Also, 3 belongs to the interval (pi/2, pi) where cosine is negative.
Then cos1 is the biggest value.
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