lim(x→0)=1-cosx/x^2
lim(x→0)(1/cosx)=?
已知lim(x→0) f(x)/(1-cosx) =2 求lim(x→0) [1+f(x)]^½
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lim(x→0)(ln(1+x^2)/(sec-cosx))
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lim x→0 1-cosx/xsinx
lim(x→0)(1-cosx)/(xsinx)=?
y=lim (x → 0) ( √1+xsinx - √cosx) / arcsin^2x.y=lim (n → ∞)
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