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cosine function is decrease where as functional argument is increase from 0 to 90 degrees .

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Let us assume that 6 and 60 are in degrees and not radians.

1. Cos Ф = adjacent side / hypotenuse in a right angle triangle

= a/b.

When angle Ф = 0, a = b and as Ф increases 'a' remains same and b (hypotenuse) increases. So cos Ф decreases continuously as Ф increases till Ф = 90 degree.

2. The graph of cos Ф shows the wave like property of Cos and it decreases between Ф = 0 to Ф = 180 deg.

So COS 6 is greater than COS 60.

1. Cos Ф = adjacent side / hypotenuse in a right angle triangle

= a/b.

When angle Ф = 0, a = b and as Ф increases 'a' remains same and b (hypotenuse) increases. So cos Ф decreases continuously as Ф increases till Ф = 90 degree.

2. The graph of cos Ф shows the wave like property of Cos and it decreases between Ф = 0 to Ф = 180 deg.

So COS 6 is greater than COS 60.