No. It has to lie in between -1 an +1 inclusive.
Cos x = adjecent/hypotenuse and for cos x to be greater than 1, you need the adjacent to be bigger than the hypotenuse. The hypotenuse is always the biggest side.
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lol! it can be less than 1 too, upto -1! it cannot be greater than 1 because hypotenuse is always longer than the adjacent and opposite side... (from pythagoras theorem)
The sine and the cosine are always less than one.
Yes, one is greater than zero.
One is greater than .2 by .8. One is five times greater than .2.
It is cosine*cosine*cosine.