To change between degrees/radians::: . [MODE] Arrow down to "Angle....." Arrow [>] to open the selector Arrow up/down to pick one Then click [ENTER] . Another TIP: make sure you use brackets correctly. i.e. tan x^3-x^2+9.5 is not the same as tan(x^3+x^2+9.5) or tan(x^3+x^2)+9.5 ( that first one actually tells the calculator tan(x^3) - x^2 + 9.5 ) . Hope this helps :)
How to find the intergration in TI-89
Angle mode, Degree/radian setting, Chapter 2, pg 53 (pg70 of 623) Tan instructions pg 510 (appendix A pg 527 of 623) Here's your manual, download this file: http://www.ti-89.org/uploads/ti-89-manual.pdf
BTW, here's a good site for you:
TI-89_org The Ultimate TI-89 FAQ & Manual
http://www.ti-89.org/faq.html
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You have to set how the calculator handles angles. To do this follow these steps: 1. Press the 'MODE' button. This brings up the calculator's main settings page. 2. Scroll down until you reach a field titled 'Angle...'. This is the setting for how the calculator handles angles, whether it will show angle answers in degree or radian format. 3. Press the right arrow which will bring up the options for that setting. You must now choose between the two ways of handling angles: -'1:RADIAN' will display angle answers in radians. -'2:DEGREE' will display angles is degrees. 4. After you have selected one of those options pres enter one more time to get out of the 'MODE' dialogue and return to the 'HOME' screen. Now try a problem and see what happens.
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