limit as (x,y) approaches (0,0) of (x^2+y^2)/(sqrt(x^2+y^2+1)-1)

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(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

simplify solve for inverse tangent line

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lim_{(x, y)→ (0, 0)}(x²+y²√x²+y²+1−1 )

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lim_{(x, y)→ (0, 0)}(x²+y²√x²+y²+1−1 )

Rationalize denominator x²+y²√x²+y²+1−1 : √x²+y²+1+1

=lim_{(x, y)→ (0, 0)}(√x²+y²+1+1)

Plug in the value (x, y)=(0, 0)

=√0²+0²+1+1

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+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

limit as (x,y) approaches (0,0) of (x^2+y^2)/(sqrt(x^2+y^2+1)-1)

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