[R] cosine and sine

[Brian O'Gorman]

Excuse me if this is has been discussed before, but,

How can I make the cos(pi/2) = 0 (instead of on my machine 6.123234e-17)
and the sin(pi) = 0 (instead of 1.224647e-16 on my machine) ?

I'd like sin(pi) == 0 to return TRUE, and is zapsmall appropriate here?
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