Question #71aff

1 Answer
Jul 12, 2016

The answer is the weird decimal number #cos^2(sqrt(-3)) ~= 0.02577#.

Explanation:

The cosine function really only outputs round fractions or whole numbers when some multiple of #pi# or a fraction of #pi# are input.

For example:
#cos(pi) = -1#
#cos(pi/2) = 0#
#cos(pi/4) = 1/sqrt(2)#

If you don't have pi in the input, you are guaranteed to receive a decimal output.