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c(-1,-4), d=6

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

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pháp tuyến của y=x²−x−1, (2, 1)

Solution

y=−13 x+53

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Tính hệ số góc của y=x²−x−1: 2x−1

Compute the slope at (2, 1): m=3

Tính hệ số góc của đường vuông góc: m_p=−13

Tìm đường thẳng có hệ số góc m=−13 và cắt (2, 1): y=−13 x+53

y=−13 x+53

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

c(-1,-4), d=6

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