Determine the Types of the Numbers cos(minus(seven pi) divide twelve)

Determine the Types of the Numbers cos(-(7pi)/12)
There are six common sets of numbers.
Natural (Counting) Numbers:
Whole Numbers: Natural Numbers and
Rational Numbers: Integers, Fractions, and Terminating or Repeating Decimals
Irrational Numbers: Non Terminating or Non Repeating Decimals
Real Numbers: Rational Numbers and Irrational Numbers
Determine which sets the numbers fit into.
Natural (Counting) Numbers:
Whole Numbers:
Rational Numbers:
Irrational Numbers:
Real Numbers:
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