Archive for the ‘Mathematics’ Category

Twitter follower semi-log graphs

twitter-distribution-followingHere are some semi-log graphs showing Twitter follower (and following) numbers.

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What did Euclid really say about geometry?

Euclid-tetrahedronEuclid's math textbook has been in use for over 2,300 years.

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Tan lines

tan curvesHere's a fun take on one of the trigonometric curves.

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Integration by parts twice

integration by partsSometimes integration by parts can end up in an infinite loop. But there is a solution.

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Explore the slope of the tan curve

slope of the tan curveYou can investigate the slope of the tan curve using an interactive graph.

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Explore the slope of the cos curve

cosine curve slope investigationWhat is the value of the slope of the cosine curve? Use an interactive graph to investigate it.

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Explore the slope of the sin curve

sine curveUse an interactive graph to explore how the slope of sine x changes as x changes.

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What does 20/20 vision mean?

eyeWe often hear the expression 20/20 vision. What do the 2 numbers mean?

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Singapore wealth - mean and median?

singapore-wealth-distributionWhen we have a distribution with a high mean but a low median, what does it look like?

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Free math graphing software

graph of 3D spiral objectHere is a short review of 2 free math graphing utilities, Winplot (Windows only) and Graphics Layout Engine (which is not so easy to use).

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