(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hi. I post part A too but I'm having trouble only with Part B.

Question.[PLAIN]http://img100.imageshack.us/img100/8297/20104ivwhytangenttoseco.png [Broken]

2. Relevant equations

I know....

[itex]y = sin x [/itex] and [itex] y = cx[/itex] intersects when ...

[itex]sin x = cx[/itex] so [itex] \frac{sin x}{x} = c[/itex]

3. The attempt at a solution

I just don't understand why [itex] \frac{sin x}{x} = c[/itex]

means that [itex] y = c [/itex] has to be tangent to

[itex] y = \frac{sin x}{x}[/itex] at the second hump?

I'm not seeing the connection...

Thank you.

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# Homework Help: Meaning of y = c if f(x) = cg(x)

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