数学的帰納法で証明する \sum_{k=1}^nk(k+1)=(n(n+1)(n+2))/3

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

☐²

x^☐

√☐

^□√☐

□□

log_□

θ

∞

∫

ddx

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

simplify solve for inverse tangent line

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prove ∑_k=1ⁿk(k+1)=n(n+1)(n+2)3

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Prove by induction ∑ _k=1ⁿk(k+1)=n(n+1)(n+2)3

Check for n=1: True

Assume for n=m: ∑_k=1^mk(k+1)=m(m+1)(m+2)3

Prove for n=m+1: True

QED

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

数学的帰納法で証明する \sum_{k=1}^nk(k+1)=(n(n+1)(n+2))/3

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