Ratio of circle's circumference to its diameter
pi
pi returns the floating-point number nearest the value of π. The expressions 4*atan(1) and imag(log(-1)) provide the same value.
4*atan(1)
imag(log(-1))
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Compute the sine of pi. The result is not exactly zero in floating point arithmetic.
sin(pi)
ans = 1.2246e-16