题目
lim(x趋向于π/4) sinx-cosx/tan^2 x-1
提问时间:2021-03-01
答案
lim(x-->π/4)( sinx-cosx)/(tan² x-1)=lim(x-->π/4)( sinx-cosx)/(sin² x/cos²x-1)=lim(x-->π/4)( sinx-cosx)cos²x/(sin² x- cos²x)=lim(x-->π/4)( sinx-cosx)cos²x/(si...
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