Knowledge Base

Solution 23891: Setting Constraints to Remove the @n Symbol From a Trigonometric Equation Using the Solve Command on TI-89 Family, TI-92 Plus Family and the Voyage™ 200.

How do I remove the @n symbol from my trigonometric equation I am trying to solve on the TI-89 Family, TI-92 Plus Family or Voyage 200?

The @n symbol in a solution for the solve command exists to show that the answer given by the calculator is true for any real integer. To restrict a trigonometric function so that the @n symbol does not show the user must restrict the equation to show only one revolution of a circle. This is done one of two ways depending on whether the unit is in degree or radian mode.

Please see the below example:

1) For radian mode use the restriction x>0 and x<2pi

2) Enter Solve(1/2-cos(x)=0,x)|x>0 and x<2pi

Using the same equation, to restrict in degree mode enter.

1) Enter Solve(1/2-cos(x)=0,x)|x>0 and x<360

Please see the TI-89 family, TI-92 family and Voyage 200 guidebooks for additional information.