Posted: 10/12/2006 8:17:05 PM EDT
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I am playing around with using CoSecant, Secant, and CoTangent functions...I want to make sure WHICH button is which on my Texas Instruments TI 30 XIIS. Over SIN the 2nd Function is SIN-1....would this be Secant? Over COSINE the 2nd Function is COS-1 would this be Co-Secant? Over Tangent the 2nd Function is TAN-1. would this be Co-Tangent? or am I WAYYYYYY off base. I used to only using Sine, Cosine and Tangent fucntions but would like to broaden my horizons a bit. |
Cos^-1 is the arccosine sin^-1 is arcsine cos(theta)=x/r arccos(x/r)=theta this is the basics, if you want some good online math reference, matweb and wolfram have good online reference sites. Google them. |
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If you have trouble remembering the ratios, try Oh Hell Another Hour Of Algebra (O/H (sine) A/H (cosine) O/A (tangent)). My dad told me that back when I was in high school and I haven't forgotten it. |
I am a senior in engineering, I never mess with much beyond Cos, Sin, & Tan and their inverses. Occassionally the hyperbolic sin and cos, but that is in some ugly transforms for electronic signals. Just draw alot of pictures. Trig and angles can get confusing fast. |
Yea. Trig identities suck! Complex notation all the way 
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See, I am up for a Machinist job ( entry level ) at work and I really want to get my trig fucntions down. Oddly, my other geometry stuff is not a problem ( things like chords, arc radians and such ) but the knowing which function to use for which ratio in trig always gets me turned around. I figure if I know the function of each one of the six functions then it won't matter which piece of info I might be missing. and yes, I am quite familiar with Pythagorean theorem...I just really want to know my trig functions as they are part of my job description ( if I can get it )...... |
Here's another good one: SOH CAH TOA ( so - ka - toe ah`) Sine=Opp/Hyp Cosine=Adj/Hyp Tangent=Opp/Adj |