[perl6]: math ~ replace multi atan's with atan & atan2 ~ add conjectural 'sin' handling optional 'base' param
[perl6]: math
~ replace multi atan's with atan & atan2
~ add conjectural 'sin' handling optional 'base' param

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@12993 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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