Applications of Trigonomatry
回答 (1)
2013-05-23 3:22 am
✔ 最佳答案
(cos x + 3 sin x) = cos x ( 1 + 3 tan x)2 sin x - cos x = cos x ( 2 tan x - 1)
so answer = (1 + 3 tan x)/(2 tan x - 1)
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