Answer:
that's as simple as it gets
Explanation:
"Simplify" usually means "combine like terms, rationalize the denominator, reduce radicals to the greatest extent, cancel common factors from fractions, eliminate parentheses," and the like.
When a function of a single variable is multiplied by a single constant, there is no simplification that can be done.
18cos(Ф)
_____
If your ∅ is supposed to be zero, then cos(0) = 1 and it simplifies to 18.