Maybe you answer is different from mine because you are running Perl in another architecture.

I am running perl in a different architecture (amd64), and I get the same result as you for perl: 
C:\_32>perl -e "print cos(100000000.0)"
-0.36338508935581

[download]
I'm on Win32, and that's using the Microsoft C runtime library (msvcrt.dll). If I instead use the mpfr library, then I get the correct result: 
C:\_32>perl -MMath::MPFR -e "$x=Math::MPFR->new(100000000.0);print cos
+($x)"
-3.6338508935569053e-1

[download]
Cheers,
Rob

In reply to Re^3: cos (100000000.0) by syphilis
in thread cos (100000000.0) by kavehmz

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