(tan X + sec X – 1) / (tan X – sec X + 1) = (1 + sin X) / (cox X)
问题描述:
(tan X + sec X – 1) / (tan X – sec X + 1) = (1 + sin X) / (cox X)
答
secX=1/cosx,tanx=sinx/cosx,通分后,便可得