若(cosα-sinα)/(cosα+sinα)=4,则tan(π/4-α)等于
人气:227 ℃ 时间:2020-05-19 02:45:29
解答
(cosα-sinα)/(cosα+sinα)=4分子分母同时除以cosα(1-tanα)/(1+tanα)=4∴ [tan(π/4)-tanα]/[1+tan(π/4)tanα]=4∴ tan(π/4-α)=4或者将tan(π/4-α)展开也可以tan(π/4-α)= [tan(π/4)-tanα]/[1+tan(π/4...
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