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

It's attached. The problem and solution are given.

2. Relevant equations

3. The attempt at a solution

I circled a part of the image in red. Is this substitution supposed to be an approximation?

I was thinking it was because one is referring to angular motion, so we're tracing out an arc, and the x is vertically linear, but I guess since it's such a small angle that it's not much different. If this is an approximation, is this the same approximation where we use sin θ ≈ θ, for small θ?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Approximation for oscillation

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