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Tính $\lim_{x\rightarrow 0^{+}}\frac{cos\sqrt{x}-1}{x}$

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#1
nguyenka1996

nguyenka1996

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 Tính $\lim_{x\rightarrow 0^{+}}\frac{cos\sqrt{x}-1}{x}$



#2
caovannct

caovannct

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 Tính $\lim_{x\rightarrow 0^{+}}\frac{cos\sqrt{x}-1}{x}$

I=$\lim_{x\rightarrow 0^{+}}\frac{-2sin^2\frac{\sqrt{x}}{2}}{x}=-\frac{1}{2}$

sử dụng $\lim_{x\rightarrow 0^{+}}\frac{sin\frac{\sqrt{x}}{2}}{\frac{\sqrt{x}}{2}}=1$







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