将原式分子分母都除以cosθ,即
(2sinθ-cosθ)/(sinθ+2cosθ)
=[(2sinθ/cosθ)-1]/[(sinθ/cosθ)+2]
=(2tanθ-1)/(tanθ+2).
为什么 2sinθ-cosθ/sinθ+2cosθ=2tanθ-1/tanθ+2
为什么 2sinθ-cosθ/sinθ+2cosθ=2tanθ-1/tanθ+2
如题,求详解.
如题,求详解.
数学人气:592 ℃时间:2020-04-07 10:41:34
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