Appendix B.pdf - Cambridge University Press

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708 Essential Mathematical Methods 3&4CASForexample:expand((a x ) b )gives the correct result only if a is statedto be positive.expand(ln(a*b)) does not result in the expectedln(a) + ln(b). It requires the condition a > 0orb > 0tobestated. It also works if both a and b are statedto be positive.4:zeros(This command solves an equation where one side of the equation is zero. The variable must benamed. The answer is given as a list.zeros(x 2 − 1, x)zeros(x 2 − y 2 , x)zeros(x 2 − y 2 , y)zeros(x 2 − y, y)zeros(x 2 − 4x + 8, x)zeros(x 2 − 4x + 1, x)zeros(x 2 − 4x + 4, x)5:approx(NosolutionsTwo solutionsOne solutionUsing this command is equivalent to choosing APPROXIMATE from the Exact/Approxsubmenu of the MODE menu. When in EXACT mode you can also press ≈ (GREENmode) to obtain approximations.6:comDenom(This gives an expression with common denominator and in simplified ratio form. The screensdemonstrate the use of this command.SAMPLE7:propFrac(This command changes a fractional expression to a proper fraction form.Cambridge University Press • Uncorrected Sample Pages •2008 © Evans, Lipson, Jones, Avery, TI-Nspire & Casio ClassPad material prepared in collaboration with Jan Honnens & David Hibbard
Appendix B—Computer Algebra System (TI calculators) 709B38:nSolve(This gives numerical solutions to equations. It will return only one solution. The syntax isnSolve(equation,variable = guess). The guess is not necessary, but can make the processfaster. The screen to the left below shows the solutions obtained by giving suitable guesses.The screen to the right below shows the solutions obtained by using a restriction. The positivesolution is obtained with the restriction x > 0 and the negative solution with x < 0. Thesyntax for the latter is shown in the entry line.9:Trig and A:Complex9:Trig will be used in a later section of this chapter, whereas A:Complex is not used.B:ExtractThis contains a submenu. The first two functions of this menu are briefly discussed here.1:getNum( This applies the common denominator function and then returns thenumerator of the result.2:getDenom( This applies the common denominator function and then returns thedenominator of the result.GraphingSAMPLEGraphing using a TI CAS calculator is very similar to graphing with a TI graphing calculator.The screens associated with graphing are listed in green directly below the screen.Y= screenFor the Y= screen press and then F1 .The default Y= screen appears as shown.The cursor appears at the y1= position. Press ENTER to takethe cursor to the Edit line.This can also be achieved by pressing F3 for Edit.Cambridge University Press • Uncorrected Sample Pages •2008 © Evans, Lipson, Jones, Avery, TI-Nspire & Casio ClassPad material prepared in collaboration with Jan Honnens & David Hibbard
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Appendix B.pdf - Cambridge University Press

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