tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x求证!
问题描述:
tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x
求证!
答
tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x
求证!