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telescoping test sum from n=1 to infinity of 2/(4n^2-1)

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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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periodicity 2cos(3x)

Solution

2π3

Decimal

2.09439…

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The possible outcomes when a coin is thrown 7 times are 2· 2· 2· 2· 2· 2· 2
Therefore, the number of possible outcomes: 2⁷

Find the number of favorable outcomes of all tosses will be tails: 1

Probability = number of favorable outcomestotal number of outcomes

=12⁷

2⁷=128

=1128

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domain 2cos(3x)

range 2cos(3x)

amplitude 2cos(3x)

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

telescoping test sum from n=1 to infinity of 2/(4n^2-1)

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