这个极限是什么?
[(cos(atan(k*sin(α))))^2+(cos(atan(k*sin(α+Δα))))^2-2(cos(atan(k*sin(α))))(cos(atan(k...
[(cos(atan(k*sin(α))))^2+ (cos(atan(k*sin(α+Δα))))^2-
2 (cos(atan(k*sin(α)))) (cos(atan(k*sin(α+Δα))))cos(Δα)]/Δα
k为常数 展开
2 (cos(atan(k*sin(α)))) (cos(atan(k*sin(α+Δα))))cos(Δα)]/Δα
k为常数 展开
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