Which expression is equivalent to cosine open paren 40 degrees close paren plus sine open paren 40 degrees close paren ?
A
cosine of open paren 40 degrees minus 10 degrees close parenB
cosine of open paren 40 degrees plus 10 degrees close parenC
sine of open paren 40 degrees minus 10 degrees close parenD
sine of open paren 40 degrees plus 10 degrees close paren