Someone can help me to solve this limit only using squeeze theorem

$$ \lim_{(x,y)\to(0,2)} x\arctan\left(\frac{1}{y-2}\right)$$

I have done the substitution: $$ \lim_{(x,v)\to(0,0)} x\arctan\left(\frac{1}{v}\right)$$

$$\arctan\left(\frac{1}{v}\right) \sim \frac{1}{v}$$

$$ \lim_{(x,v)\to(0,0)} \frac{x}{v}$$

$$0\le \frac{|x|}{|v|}\le$$

Now I'm stucked, I don't know how to continue the inequality. Someone can help me?

  • $\begingroup$ Your substitution is only correct near 0, not near $\infty$. $\endgroup$
    – Miguel
    Jan 27, 2016 at 22:58

1 Answer 1


Note that if $y\ne 2$ then $$0\le \left|x\arctan\left(\frac{1}{y-2}\right)\right| \le \frac{\pi}{2}|x|.$$ Now squeeze.


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