(sin x) + (cos x) = (tan x) + 1/(tan x)0

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(sin x) + (cos x) = (tan x) + 1/(tan x)0
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(sin x) + (cos x) = (tan x) + 1/(tan x)0
(sin x) + (cos x) = (tan x) + 1/(tan x)
0

(sin x) + (cos x) = (tan x) + 1/(tan x)0
tanx先化简
然后有两步关键 一步为cosx^2+sinx^2=1
第二步为设cosx+sinx=t
你再试试,不明白追问,给你完整步骤,自己做出来的映像深刻.

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