Solving for angle on TI-89 in limited range
Even though you can use the inverse trig functions to find an angle, sometimes i'd rather just have my calculator to solve an equation with the variable inside a trig function. This works fine except that you get all the possible solutions, and if you want to find the solution in say [0,pi] you have to figure it out yourself. When I ask it to find an answer in a limited range it gives me all the answers anyway.
Any ideas on how to make it give you an answer in a given range?
Any ideas on how to make it give you an answer in a given range?
posted by davidhj at 12:28 AM
2 Comments:
No, but I have a lot of experience at getting my calculator to tell me that the angle I'm looking for is 360. I think it's more reliable to use "x" instead of "cos^-1(x)" and to just plug x into the inverse cosine function.
or you could graph it in the limited range, find the interceps, and use the exact( function from the home screen.
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