How to Express f(x,t) in Big Oh Notation?

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The function f(x,t) is defined as f(x,t) ≤ x^{1/2} √(1+t²). This can be expressed in Big O notation as O(√x * t), effectively capturing the growth rates of both variables x and t. The discussion confirms that this notation accurately reflects the upper bound of the function in relation to its parameters.

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Suppose I have a function of x and t such that

[tex] f(x,t) \leq x^{1/2} \sqrt{1+t^2}.[/tex]

How should I express this in big Oh notation in terms of both x AND t?
 
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##O(\sqrt{x}t)##?
That covers both parameters.
 

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