By Martin Erickson

ISBN-10: 0883858290

ISBN-13: 9780883858295

Every mathematician (beginner, beginner, alike) thrills to discover uncomplicated, stylish ideas to probably tough difficulties. Such satisfied resolutions are known as ``aha! solutions,'' a word popularized via arithmetic and technology author Martin Gardner. Aha! ideas are fantastic, lovely, and scintillating: they show the great thing about mathematics.

This ebook is a suite of issues of aha! options. the issues are on the point of the school arithmetic scholar, yet there can be whatever of curiosity for the highschool scholar, the instructor of arithmetic, the ``math fan,'' and somebody else who loves mathematical challenges.

This assortment contains 100 difficulties within the components of mathematics, geometry, algebra, calculus, likelihood, quantity thought, and combinatorics. the issues begin effortless and customarily get more challenging as you move throughout the publication. a couple of suggestions require using a working laptop or computer. a big characteristic of the publication is the bonus dialogue of comparable arithmetic that follows the answer of every challenge. This fabric is there to entertain and tell you or aspect you to new questions. if you happen to do not take into account a mathematical definition or idea, there's a Toolkit at the back of the ebook that would help.

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**Extra info for Aha! Solutions**

**Example text**

Simplifying, we obtain = = a2 a3. The general statement of Jensen's inequality Equality occurs if and only if al can be proved similarly or by induction on n. 2 Intermediate Problems I hope that you enjoyed the elementary problems. Now let's try a selection of somewhat more difficult problems. In this chapter, we can expect to use familiar techniques from calculus and other branches of mathematics. As usual, we are looking for illuminating proofs. Aha! solutions are to be found! 1 Algebra Passing Time At some time between 3:00 and 4:00, the minute hand of a clock passes the hour hand.

The other half is the converse statement: if I + II = III, then the angle opposite III is a right angle. 7Pierre Varignon (1654-1722) was a mathematical physicist and early advocate of calculus. 3 Geometry 21 Solution Here is the most visually compelling proofthat I know of. It requires very little explanation. Both of the above figures show four copies of the given right triangle, arranged inside a square. The shaded area in the figure on the left is the square on the hypotenuse. Clearly. the shaded area doesn't change when the four triangles are rearranged as in the figure on the right.

Tangent of a Sum In trigonometry, the formula for the tangent of a sum of two angles is tan(A Find a formula fortan(A + B) = tan A + tan B . I - tan A tan B + B + C + D + E) in terms ofthe tangents of the angles A, B, C, D,and E. Solution We start by finding a formula for the tangent of the sum of three angles. Using the formula given for the tangent of the sum of two angles, we have tan (A + B + C) + B) + tanC + B) tan C tanA+tanB + tan C i-tan A tan B tan(A = ---'----:-----'-_____-----:- 1 - tan(A 1- ( = tanA+tanB ) i-tan A tan B tanC tan A + tan B + (1 - tan A tan B) tan C 1 - tan A tan B - (tan A + tan B) tan C tan A + tan B + tan C - tan A tan B tan C I-tanAtanB -tanAtanC -tanBtanC' Notice that the numerator in this formula contains the sum of tan A, tan B, and tan C, as well as the product of these terms, while the denominator contains all products of pairs of these terms.

### Aha! Solutions by Martin Erickson

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