User David - Mathematics Stack Exchange

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	age	18
visits	member for	1 year, 8 months
	seen	May 6 at 20:10
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	959 reputation	bio	website		visits	member for	1 year, 8 months
216 badges		location	NY		seen	May 6 at 20:10

18

73

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2

kviews

What does $2^x$ really mean when $x$ is not an integer?

apr 23 '12 at 19:00 Michael Hardy 47.7k

1

8

votes

2

answers

299

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Is there another representation for $x^x$

algebra-precalculus exponentiation

nov 8 at 2:58 J. M. 38.8k

8

votes

4

answers

588

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Inverse of the natural log function $y =\ln x$

calculus algebra-precalculus logarithms

apr 28 '12 at 19:17 Shaun Ault 5,253

5

votes

1

answer

178

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Why is $i^i$ real? [duplicate]

calculus algebra-precalculus

oct 19 at 13:03 David 959

4

votes

2

answers

262

views

What does $\log^{2}{x}$ mean?

notation logarithms

jun 29 at 3:52 Peter Tamaroff 25.3k

3

votes

2

answers

211

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Ex${{{}}}$tremely Tricky Probability Question?

probability algebra-precalculus

oct 19 at 4:50 Ross Millikan 83.1k

3

votes

1

answer

93

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How do I refer to a certain element in a set?

algebra-precalculus notation

may 26 '12 at 13:13 Paul Slevin 1,822

1

3

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2

answers

147

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What does a particular part of this equation mean?

calculus combinatorics notation

feb 5 '12 at 23:12 David 959

3

votes

5

answers

379

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What does the exclamation mark do?

algebra-precalculus notation

nov 10 '11 at 12:35 Martin Sleziak 20.3k

2

votes

2

answers

80

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How do I approach a question like this?

algebra-precalculus

oct 26 at 14:20 David 959

1

2

votes

4

answers

168

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How to find the limit of an uncountably infinite expression?

calculus limit

jul 23 at 3:14 Michael Hardy 47.7k

2

votes

1

answer

98

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How do you solve this equation: $5x^{\frac{1}{x}}=3$

algebra-precalculus logarithms

jun 2 '12 at 16:18 TMM 7,156

2

votes

1

answer

63

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Can someone help me with this true or false problem?

calculus integral

apr 19 '12 at 0:32 Asaf Karagila 90.1k

2

votes

6

answers

560

views

Summing numbers which increase by a fixed amount (arithmetic progression)

algebra-precalculus

apr 6 '12 at 23:55 megaritzmom 1

2

votes

4

answers

257

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Is there any way to find out $x! = n$ by hand?

algebra-precalculus

apr 4 '12 at 8:41 Angela Richardson 2,218

2

votes

4

answers

580

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What is the summation operator used for in Mathematics?

sequences-and-series notation

feb 11 '12 at 18:14 Bill Cook 8,630

2

votes

2

answers

300

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What are functions used for?

calculus algebra-precalculus trigonometry functions notation

feb 11 '12 at 17:49 Henning Makholm 53.5k

1

vote

3

answers

377

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What does | mean?

notation special-functions elliptic-functions

apr 29 at 11:47 Raymond Manzoni 15.2k

1

vote

3

answers

126

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Confusing percentage question

algebra-precalculus

nov 7 at 19:59 Vinod Vishwanath 321

1

vote

3

answers

84

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How do I solve a question like this?

algebra-precalculus

oct 26 at 14:19 David 959

1

vote

1

answer

61

views

Testing probability through an equation?

probability algebra-precalculus

oct 11 at 1:43 segiddins 105

1

vote

4

answers

1

kviews

Create a C++ program to evaluate the following series: $\sin x \approx x - \frac{x^3}{3! }+\frac{x^5}{5!}-\frac{x^7}{7!}\cdots\pm\frac{x^n}{n!}$ [closed]

calculus algebra-precalculus computer-science

aug 19 at 16:13 lab bhattacharjee 27.9k

1

vote

3

answers

159

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How to express $\cosh(4x)$ as a polynomial in $\cosh(x)$

algebra-precalculus trigonometry

apr 21 '12 at 14:13 André Nicolas 160k

1

vote

2

answers

67

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How do I solve this equation?

algebra-precalculus trigonometry

apr 18 '12 at 0:09 David Mitra 40.9k

1

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3

answers

2

kviews

How do I find the fourth term in the coefficient of the expansion of $(a - 4b)^9$

calculus algebra-precalculus

apr 11 '12 at 16:01 David 959

1

vote

3

answers

396

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To the nearest degree, the solution of the equation $3\space\sin^2(x ) - 2\sin(x) = 1$ in the interval $[270^\circ, \space 360^\circ]$ is $x = ?$

algebra-precalculus trigonometry

apr 6 '12 at 22:29 Michael Hardy 47.7k

1

vote

1

answer

124

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Solve to the nearest degree, $3\space \sin^2(x) + 3\sin(x) - 2 = 0$ for the interval$ [0^\circ, \space 360^\circ]$

algebra-precalculus trigonometry

apr 6 '12 at 17:30 André Nicolas 160k

1

vote

3

answers

520

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If $\cos\theta = \sin\theta$, then what is $\cos2\theta$?

algebra-precalculus trigonometry

mar 27 '12 at 3:18 Arturo Magidin 158k

1

vote

1

answer

153

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What does $\sum$ mean without a starting index and limit?

calculus algebra-precalculus

mar 25 '12 at 19:04 Sasha 41.4k

1

vote

1

answer

85

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Help with trigonometry?

homework algebra-precalculus trigonometry

mar 17 '12 at 16:14 Michael Hardy 47.7k

David

50 Questions