second derivative of test 1/(9+x^2)

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

☐²

x^☐

√☐

^□√☐

□□

log_□

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ddx

≥	≤	·	÷	`x`^◦	(☐)	\|☐\|	(`f` ◦ `g`)	`f`(`x`)	ln	`e`^☐
(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

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22−18÷ 3+(−1)²

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22−18÷ 3+(−1)²

Follow the PEMDAS order of operations

Calculate exponents (−1)² : 1

=22−18÷ 3+1

Multiply and divide (left to right) 18÷ 3 : 6

=22−6+1

Add and subtract (left to right) 22−6+1 : 17

=17

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

second derivative of test 1/(9+x^2)

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