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同角三角比基本关系tana=2,则(2sina-cosa)/(2sina+cosa)的值是?过程是怎么样的?

题目详情
同角三角比基本关系
tana=2,则(2sina-cosa)/(2sina+cosa)的值是?
过程是怎么样的?
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答案和解析
the molecule and the sector of the fraction divided by cosa simultaneously,we can acquire the following fraction:
(2tana-1)/(2tana+1)
because tana=2
therefore the equal above equates 3/5.