Question: How to find the domain of a function

Hello there,
I'm currently working on a school-related assignment, where I have to put two functions equal each other to find their crossing point. My issue is, that these two functions are waves, and continiue into infinite.
If I put them equal as this, my document crashes:
f(x) = g(x)

My question is then, if I can put some requirement to Maple, so it only calculates from significant X-intervals

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