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Why does my cas inspire give me the wrong trig function derivative?

When I try to get the Derivtive of (secx) the calculator gives me the wrong answer and i really need it for an exam.

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Posted on Jan 02, 2017

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SOURCE: graphing trig functions

Put the calculator in radian mode and it will graph trig functions just fine. If you don't know how to change it to radians, then go to mode and cursor over to select radians. I am assuming you know where the sine, cosine, tangent, etc. keys are.

Posted on Jan 04, 2008

  • 1 Answer


The BAII Plus comes from the factory set to assume monthly compounding. To fix this problem press 2nd then I/Y and enter 1 when prompted.

Posted on Apr 03, 2008

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SOURCE: wrong trig ratio

Your calculator is set in radians. Press mode key. Arrow down to 3rd line. Highlight degree and press enter. Your calculator is now in degrees, not radians. To get out of the mode screen and back to home screen, press 2nd and then mode.

Posted on Aug 06, 2009

  • 6 Answers

SOURCE: Using Tan,sin, cosin

Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert 360[degrees] = 2* pi [radians]
(easy to remember, 360deg in a circle, 2pi radians in a circle)
Good luck

Posted on Aug 12, 2009

  • 7993 Answers

SOURCE: Differentiating and Integrating Problems

This means that you are using a non-algebraic variable in an expression. I know, I am not even paraphrasing. Exemple: if you write 2 + johnQ, where johnQ is a table of data, a picture or a GDB, graphical data base object.

8d787a6.jpg Here is an exemple where mat is a 2X2 matrix and mot is a table.
Hope it helps.

Posted on Sep 14, 2009

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1 Answer

Ti-nspire cx CAS gives answer in degrees even though it is in radians mode.

When you set some configuration parameter you must scroll down the setup until you reach the OK button. Press the OK button to validate.

Oct 09, 2014 | Texas Instruments TI-Nspire CX CAS...

1 Answer

Why is my ti84 giving me wrong answers when I use trig functions?

Your right you should be in degree mode. However, my guess is you are somehow entering in cot wrong in your calc. Recall cot = 1/tan! In your graphing calculator enter: 35(1/tan(61) = 19.4.
Hope this helped!

Jul 09, 2014 | Texas Instruments TI-84 Plus Calculator

2 Answers

How do you find the derivative without values for x

I am not sure I understand what you want, but if I am guessing right, you need to calculate formulas for derivatives, where the name of some variable appears eg= d(x^2)/dx = 2 x.
Sorry, the calculator does not have a CAS, you cannot perform symbolic calculations regardless of the subject (derivatives, integrals, sums of series, factoring polynomials, expanding polynomial products, polynomial division, etc.)

Feb 08, 2012 | Casio FX-9860G Graphic Calculator

1 Answer

My calculator gives me the wrong answer for trig. functions. I have all the right settings.

The results of calculations involving trigonometric functions are dependents on the angle units. So if angles are in degrees the calculator must be configured so.
To set angle unit one presses SHIFT MODE to access SETUP and select the number that corresponds to the unit desired.

Aug 26, 2010 | Casio fx-300ES Calculator

1 Answer

Well i tried to solve problem as in finding limits and derivatives but the calculator won't provide me the answer and it says i should use cas. Im not sure what cas is.

CAS is short for Computer Algebraic system such as MAPLE and other software. But some calculators can not find general solutions or non-numerical solutions to problems.
Were you trying to find numerical solutions; graphical solutions, or symbolic solutions. Most calculators can not do the symbolic things; you might have to upgrade to a ti-89 or something more powerful.
Good Luck

Jun 25, 2010 | Texas Instruments TI-Nspire Graphic...

1 Answer

Confusion on creating a prograM

"Input" is a command, which inputs a value. Try this:

Input X:tan^-1(1/X)

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

1 Answer

When I put X^(1/3) into Y=, and go to nDeriv, and find the derivative at X=0, the calculator gives me 100. I (and a few math teachers) have done this many times by hand, and we all get undefined as an...

The derivative of the cubic root of x is, as you wll know, equal to (1/3)*x^(-2/3). Its limit as x approaches 0 is undefined. However the calculator uses approximate representations of numbers to calculate. And you can never be sure what it is going to give as results near singularities (poles of functions).

Calculators with Computer Algebra Systems can do better. To show you this, I am enclosing a screen capture showing you the correct result.
On this screen I defined a function u =f(v) where u is the derivative of cubic root of v. I stored 0 in the dummy variable v, and I evaluated the function u at v=0. You can see that the result displayed is undefined.
That this result is deemed correct seems to me just a matter of convention. We do not know, we cannot know, or we dont care to know? It will not make any of us lose sleep.

Hope it helps.

Nov 10, 2009 | Texas Instruments TI-84 Plus Silver...

2 Answers

Can i calculate calculus using fx-991ms

If you want to get an answer like 1/2X for d/dx(X^2), you will have to purchase a CAS calculator like Casio's Algebra FX-2 or Classpad. TI series calculators also have CAS.
However, you can calculate the numerical values of derivatives and integrals only.
To calculate the value of a proper integral:

  1. Press the 'ON' key;
  2. Press the Integral key b8325f5.jpg;
  3. Enter your expression (example X^2+X-3 etc);
  4. Press the 'comma' key after your expression;
  5. Input the first limit after comma, input comma again after first limit;
  6. Close brackets;
  7. Press the equals key, display may return after a while with the answer.
for eg to calculate xdx from 0 to 2, input as follows:


To calculate derivative at a point:

  1. Press Shift and then the integration key.
  2. Enter your function;
  3. Input comma;
  4. input the point at which you want to evaluate the derivative;
  5. Close bracket and press enter.
Example, to calculate d/dx X^2 at 3 input:

SHIFT+dx key X^2,3)

Display looks like this: d/dx(X^2,3).

Oct 23, 2009 | Casio FX-300MS Calculator

2 Answers

Wrong trig ratio

Your calculator is set in radians. Press mode key. Arrow down to 3rd line. Highlight degree and press enter. Your calculator is now in degrees, not radians. To get out of the mode screen and back to home screen, press 2nd and then mode.

Aug 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Inverse Functions on Casio fx-270W PLUS don't seem to work

because cotangent, cosecant, and secant are all inverse trig functions, just type in 1 / |shift| trig function and the number if you are finding the angles. It might not be a dedicated button, but its an extra push, and it will give you the same result. *note that I put the shift press only because that is how you get the inverse tan to get an angle from a tan ratio.*

May 04, 2009 | Casio FX-270W Calculator

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