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## #1 Help Me ! » ti-89 » 2005-05-10 15:11:02

irefay
Replies: 1

Anyone familure with it?
I would like to use it for finding the general solution of equations.

cos(x)-1=-cos(x)

On the calc I get x=(6*@n154+1)Pi  or x= (6*@n154-1)Pi
3                              3

I know that the 154 part increses everytime I do another problem like this.

## #2 Help Me ! » Solar Water Boiler » 2005-05-04 13:32:53

irefay
Replies: 1

Hello
I am creating a solar water boiler. The max dimensions are 1meter diameter. What I would like to do is create a giant parabola with water can at its focus point. Unfortunately, I need to brush up on my parabolic knowledge. The parabola should be as wide as possible in order to capture the maximum amount of sunlight but the focus must stay within 1 meter of the origin of the parabola. Anyone want to run me through first few steps?
Thanks a bunch

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