prove by induction \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`)

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√☐

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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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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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×▭▭	(	1	2	3	−	`x`
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prove by induction \sum_{k=1}^nk(k+1)=(n(n+1)(n+2))/3

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