mathematical theorem
the answer of consecutive cosines function for each angle (in degrees) is close to 1 (approximately 0.99847741)
consecutive-cosines is a recursive function.
f(1, x) = cos(x)
f(2, x) = cos(cos(x))
f(3, x) = cos(cos(cos(x)))
f(4, x) = cos(cos(cos(cos(x))))
...
f(n, x) = cos(f(n-1, x))
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