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SOURCE: I can't get my TI-nspire
The TI Nspire has two calculation modes: Auto and Approximate. In Auto mode the calculator will attempt to do exact calculations. If that is not possible then the results are displayed as decimals. The non CAS version does not do symbolic manipulations, only the CAS version can do that.
However if you are actually using the CAS calculator, then go to the settings ( Settings>General ) and change the settings for the calculatoion mode to EXACT. The Non Cas does not have that third choice.
SOURCE: when i put in integrals
You are not using the right units. The integrals of functions involving angles (trigonometric functions) that you find in tables and other refrerences are valid only for the natural angle unit which is the radian. With any other angle unit (degree, gradian) there is a scale factor to take into account. That is the factor yoy are complaining about.
If it were not the case, the same integral will have two different values depending on the unit you use: and that cannot be.
If you want the calculator to give you the standard integrals in reference tables you must set the default angle unit to be radian.
Let x_deg be an angle in degrees and x_rad the corresponding value in radians.
180 deg=Pi rad
x_deg/180=x_rad/Pi
x_deg =(180 deg/PI)*x_rad
calculating the differentials of bot sides you obtain
dx_deg= (180/Pi) dx_rad
Similarly, with grads
dx_gr=(200/Pi)*dx_rad
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