Sin/Cos To Radical

nomadic · Joined: 23 Sep 2009 Posts: 2

Input: cos(45)
Output: cos(45)

What would be perfect would be sqrt(3)/3

Anyway to make the calc give sin/cos in radical format?

Or even take a decimal to Radical?

BlainUSM · Joined: 24 Oct 2009 Posts: 30 Location: New England

Approach 1: I'm guessing that you're trying to find the cosine of 45 degrees. If so, you can change the mode from radians to degrees. To do so, push the "MODE" key on the Ti-89 keypad. Select "DEGREE" instead of "RADIAN". Then press enter to save.

Approach 2: Enter cos(45 degrees) with the following key sequence:

INPUT: "2nd", "COS", "4", "5", "2nd", "|", ")", "ENTER"

OUTPUT: sqrt(2)/2

The second approach will be better if you work mostly with radians and occasionally with degrees whereas the first approach will be better if you work mostly with degrees and only occasionally with radians.