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I wanted to know where the h went when the limit was applied to the cos function they have used the trig fuction Sin A - Sin B, click on the link to see the picture

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  • $\begingroup$ Please type your question here, rather than making a link to a picture. $\endgroup$
    – zipirovich
    Commented Jan 2, 2018 at 21:12

3 Answers 3

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It uses the following property : $\lim_{x \rightarrow 0} \frac{sin(x)}{x} =1$.

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$$lim_{x \rightarrow 0} \frac{sin(x)}{x} =1$$

You have to learn how to use LATEX so to help us to understand the problem and where the problem is!This link will help you https://oeis.org/wiki/List_of_LaTeX_mathematical_symbols

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There is an identity: $\lim_{x\to0}\sin(x)/x = 1$.

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