TI-Nspire CX- Inverse trig help

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Summary:

Can't get functions such as Cos^-1 to work. Domain Errors seem to be the problem.

TI-Nspire CX- Inverse trig help

hellofcd 20 Jul 2011 21:46

I don't know if this is the right place to post but I've been having trouble finding anywhere that can help me, nothing on the TI website. So I've recently got the TI-Nspire CX and, whilst the Normal Trig functions work fine, I can't seem to get the inverses to work. My angles are set to degrees and Real or Complex is set to Rectangular. I'm probably being daft but can someone help?

Re: TI-Nspire CX- Inverse trig help

Qwerty_55 01 Aug 2011 17:54

I suppose it's a little late to answer this, but…

The way TI does it, the inverse trig functions are only defined between -1 and 1. Try that and see if it works.

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(∂²Ψ)/(∂x²) = -(2m(V(x)-E)Ψ/( ℏ²Ψ)

Melissa (guest) 02 Jun 2015 12:39

It still doesn't work. I just tried cos^-1 (0.5) and it gave me 1.0472

lirtosiast 02 Jun 2015 20:23

Please don't post in threads this old unless you have something significant to add.

1.0472 is arccos(0.5), in radians, correctly rounded to the fourth decimal place.

Last edited on 02 Jun 2015 20:32 by lirtosiast Show more