Chapter 9: Problem 1
Multiply 8023 by 4638 using the method of al-Uqlidis?
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Chapter 9: Problem 1
Multiply 8023 by 4638 using the method of al-Uqlidis?
These are the key concepts you need to understand to accurately answer the question.
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The latitudes of Philadelphia and Ankara, Turkey, are the same \(\left(40^{\circ}\right)\), with the first at longitude \(75^{\circ} \mathrm{W}\) and the second at longitude \(33^{\circ} \mathrm{E}\). Calculate the distance between Philadelphia and Ankara along the latitude circle, by first calculating the radius of that circle, using 25,000 miles for the circumference of the earth. Then calculate the distance along a great circle, by noting that the chord connecting the two cities can be thought of as a chord of that circle as well as a chord of the latitude circle. (Hint: You will have to convert the chords to the appropriate sines to make this calculation.)
Show, as did Sharaf al-Din al-T?si, that if \(x_{2}\) is the larger positive root to the cubic equation \(x^{3}+d=b x^{2}\), and if \(Y\) is the positive solution to the equation \(x^{2}+\left(b-x_{2}\right) x=\) \(x_{2}\left(b-x_{2}\right)\), then \(x_{1}=Y+b-x_{2}\) is the smaller positive root of the original cubic.
Show using calculus that \(x_{0}=\frac{2 b}{3}\) does maximize the function \(x^{2}(b-x)\). Then use calculus to analyze the graph of \(y=x^{3}-b x^{2}+d\) and confirm Sharaf al-Din's conclusion on the number of positive solutions to \(x^{3}+d=b x^{2}\).
Complete the solution of Ab? K?mil's problem in three variables given in the text by now beginning with the assumption that \(z=1\).
Show that 1184 and 1210 are amicable numbers that are not a consequence of the theorem of Th?bit ibn Qurra.
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