Friday, March 12, 2010

高中三角系列：三角恒等式_5

三角恒等式进阶题一题。

若 $\cos x+\sin x=\dfrac{1}{5}$ ，$0\leq x \leq \pi$ , 则 $\tan x=?$

Posted by Frank, Wong at 11:03 AM
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