Question about Texas Instruments TI-89 Calculator

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How to solved the series in my calculator, (integral with sen and cos), AND solve sumatories interval of convergence of the power series. Taylor series and MaClaurian

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Unfortunately, TI-89s are not very good at infinite series. You're better off using something more powerful like Matlab or Mathematica. Sorry!

Posted on Oct 04, 2009

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HOW to solve integration on casio fx-991es


The fx-991ES does not do indefinite integrals.

For definite integrals, use the [integral] key just below and left of the big round cursor pad. For example, to calculate the definite integral of x^2 dx from 0 to 1, press [integral] [alpha] [X] [cursor-right] [0] [cursor-right] [1] [=]. After about a second you should see 1/3.

Dec 20, 2014 | Casio Calculators

1 Answer

How to calculate differential equation on Casio fx-991es


You can calculate first derivatives of some functions at given points; you can calculate definite integrals over a given interval, but you cannot solve differential equations.

Aug 10, 2014 | Calculators

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How do you change the interval for a arc cos


I'm not sure of the question, but to plot arccos set mode to: graph='function' and angle to 'degrees' (for example). Go to WINDOW and set xmin=-1, xmax=1, xscl=0.1, ymin=0, ymax=180, yscl=50, and xres=1. Press GRAPH. You will get a plot of arccos from -1 to 1.

Mar 31, 2014 | Texas Instruments TI-89 Calculator

2 Answers

Evaluating a problem using integration with sin x and cos x


4/sqroot2 is the same value as 2sqroot2, about 2.828 . It's just a matter of how the calculator and the textbook chooses to represent the value.

Dec 30, 2012 | Calculators

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Whenever i type in 2nd cos(1301.16) and press enter, it tells me that i have a domain error? how can i fix this?


The key sequence [2nd] [Cos] calls the function arcosine or cos^-1. However that function takes its values in the range of the cosine function which is the interval [-1,1].
As you can see, your value of 1301.16 is clearly outside the interval [-1,1].

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

2 Answers

How to solve for the trigonometric functions in the casio scientific calculator?


Press the relevant function key [SIN],[COS],[TAN] followed by the angle value.
For inverse trigonometric functions [SIN^-1], COS^-1], or [TAN^-1], Press [SHIFT][SIN], [SHIFT][COS], or [SHIFT][TAN].
For other functions
sec(x)=1/cos(x)
csc(x)=1/sin(x)
cot(x)=1/tan(x)

When calculating trigonometric functions one must make sure that the angle unit the calculator is using is the correct one.

Aug 26, 2010 | Casio FX-115ES Scientific Calculator

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I tried to type in 2nd cos(3180.04) but it just says err. What do i do to fix this?


You are indeed committing an error. The sequence [2nd][COS] is activating the function arcosine or arccos or cos^-1, the inverse of the cosine function. If you remember the properties of the cosine functions, you know that cos(x) is defined over the real line ]- infinity to infinity[, but its range spans the interval [-1,1].
Since the arcosine function is the inverse of the cosine, its domain of definition is the range of the cosine, namely the closed interval [-1,1].

Thus if you enter [2nd][COS][3180.04] the calculator flags this as a domain error, because 3180.04 is outside the interval [-1,1]

Restrict the argument of cos^-1 to any value inside the closed interval [-1,1].
When manipulating the trigonometric functions and their inverses you must keep in mind that the results you get are dependent on the angle unit your calculator is configured for (deg, rad).

Jun 29, 2010 | Texas Instruments TI-84 Plus Calculator

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Err:no sign chng


If you were trying to find the roots (zeros) of an algebraic equation with the solve( command or the interactive solver you might have supplied an interval where the function is always positive or always negative. If the expression is always of the same sign on an interval, the interval does not contain a root.
  • If you extend the interval, the procedure may not converge fast enough and the calculator may not find the solution.
  • Abetter way to do it is to sketch the graph of the function and use the graph to choose a reasonable interval that extends on both sides of the root, and a better initial guess.
If you were doing some financial calculations,
  • You attempted to calculate the I% variable when FV, N*PMT, and PV are all positive, or all negative.
  • You tried to calculate Irr( when neither CFlist, nor CFO is positive
  • You tried to calculate Irr( when neither CFlist, nor CFO is negative

Jun 19, 2010 | Texas Instruments TI-84 Plus Silver...

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I keep getting no sign change error


To make things easy for the persons who would venture to help you, you should try to supply more information concerning what you are trying to do. We cannot always read people's mind.

If you were trying to find the roots (zeros) of an algebraic equation with the solve( command or the interactive solver you might have supplied an interval where the function is always positive or laways negative. If the expression is always of the same sign on an interval, the interval does not contain a root.
  • If you extend the interval, the procedure may not converge fast enough and the calculator may not find the solution.
  • Abetter way to do it is to sketch the graph of the function and use the graph to choose a reasonable interval that extends on both sides of the root, and a better initial guess.
If you were doing some financial calculations,
  • You attempted to calculate the I% variable when FV, N*PMT, and PV are all positive, or all negative.
  • You tried to calculate Irr( when neither CFlist, nor CFO is positive
  • You tried to calculate Irr( when neither CFlist, nor CFO is negative

Feb 14, 2010 | Texas Instruments TI-84 Plus Silver...

1 Answer

Cos A + 4.37/7.25 I cannot figure how to solve


Here's how in 4 easy steps (I substituted "A" for "X", my more favorite variable.):

1.) Set calculator to "Degree"
2.) Given-- (cos( X))
3.) Given--(4.37/7.25)==> (437/725)
4.) Add--(cos( X)+ (437/725)

Apr 15, 2009 | Texas Instruments TI-83 Plus Calculator

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