[sin(π/2-x)+sin(π-x)]/[cos(-x)+sin(2π-x)]=2013根据诱导公式,化简(cosx+sinx)/(cosx-sinx)=2013左边分子分母同时除以cosx:(1+tanx)/(1-tanx)=2013∵tan5π/4=tan(π+π/4)=1∴(tan5π/4+tanx)/(1-tan5π/4tanx)...