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August 2022 1 10 Report

решить,но не через фотомач и не используя формулу Лопиталя, подробно

а)Lim arcsin8x/5x
b)Lim 1-cos4x/1-cos16x
c)Lim 1-cos7x/1-cos8x

Везде х--->0

ответы которые должны получиться:
а)1.6
b)1/16
c)49/64

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NNNLLL54

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$1)\; \lim\limits _{x \to 0}\frac{arcsin8x}{5x}=[\; arcsin\alpha \sim \alpha \; \; pri\; \alpha \to 0\; ]=\lim\limits _{x \to 0}\frac{8x}{5x}=\frac{8}{5}=1,6\\\\\\2)\; \lim\limits _{x \to 0}\frac{1-cos4x}{1-cos16x}=\lim\limits _{x \to 0}\frac{2sin^22x}{2sin^28x}=[\; sin\alpha \sim \alpha \; \; pri\; \alpha \to 0\; ]=\lim\limits _{x \to 0}\frac{(2x)^2}{(8x)^2}=\\\\=\lim\limits _{x \to 0}\frac{4x^2}{64x^2}=\frac{4}{64}=\frac{1}{16}$

$3)\; \lim\limits _{x \to 0}\frac{1-cos7x}{1-cos8x}=\lim\limits _{x \to 0}\frac{2sin^2\frac{7x}{2}}{2sin^24x}=\lim\limits _{x \to 0}\frac{49x^2}{4\cdot 16x^2}=\frac{49}{64}$

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