Which expression is equivalent to sine open paren pi over 12 close paren minus cosine open paren pi over 12 close paren ?
A
cosine of open paren negative pi over 2 close parenB
sine of open paren negative pi over 2 close parenC
cosine of open paren 2 pi over 3 close parenD
sine of open paren 2 pi over 3 close paren