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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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simplify solve for inverse tangent line

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lu decomposition (

1	2	3
4	6	9
3	7	1

)

Solution

L=(

1	0	0
4	1	0
3	−12	1

), U=(

1	2	3
0	−2	−3
0	0	−192

)

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Solution steps

One step at a time

(

1	2	3
4	6	9
3	7	1

)

Multiply by the identity matrix

1	0	0
0	1	0
0	0	1

)(

1	2	3
4	6	9
3	7	1

)

Use Gaussian Elimination

1	0	0
4	1	0
3	−12	1

)(

1	2	3
0	−2	−3
0	0	−192

)

Therefore

L=(

1	0	0
4	1	0
3	−12	1

), U=(

1	2	3
0	−2	−3
0	0	−192

)

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1	2	3
4	6	9
3	7	1

) or choose below

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

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