Sometimes, I don't know how to present an answer well.(adsbygoogle = window.adsbygoogle || []).push({});

For [itex] sin (x+y)=sin (5x+z) [/itex]

For y and z are constant. You may subsitute some value into it.

If the range of x is restricted to [itex] -\pi < x < \pi [/itex],

naturally we will use [2pi-(5x+z)] or [pi-(5x+z)]. However, in some situation as I mentioned before, the required x value cannot be found in this way. Perhaps,

we need to use [6pi-(5x+z)]=x+y instead to find out the value in the required range. How should I present? Generally, no one subs. pi and 2pi , then 5 pi , it's very strange, some marks maybe conserved for this reason.

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# Homework Help: Presentation about Tri.

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