π

(-π π π πR- π r 2kπ+π |logπ a/π| kπ+π/4 π_π英语 化简/π-5/+/4-π/+/-π+3.1/ sinπ+cos+(-π)+tanπ过程. 已知π 设π 已知π π/4 π/6 已知π 已知π π/6