need any advice on how the best way to approach trig identities

Question

whpalmer4 · Answer

Learning them, proving them, what?

amistre64 · Answer

learn what sin is,  and then all that is not sin fits into place

amistre64 · Answer

and the pythag id may be desired ... other than that its a fly by night operation

mrnood · Answer

We need more info about what you'd like help with. Not tooo sure what amistre is saying.
Ask a clear question and you will get help

amistre64 · Answer

lol, thats how i deal with trig is all

mrnood · Answer

@amistre64 OK for you - but it's not helpful to the OP

amistre64 · Answer

well, since your not the OP, i dont think you can make that determination.  other than that, i agree that they need to be more specific

whpalmer4 · Answer

@MrNood I'm not so sure that I agree.  If you really understand sin well, you can build quite effectively on that framework.  If you don't understand it, you're going to be building on quicksand.

amistre64 · Answer

i aslk:  what is that sign over there?

sine is defined as over/hyp

cosine is not sine so it has to be the other leg .. adj/hyp

tangent is sin/cos ....

the other 3 are the flips of these.

pythag is id sin^2 + cos^2 = 1

amistre64 · Answer

the halfangles i always have to draw ..

anonymous · Answer

basically i just need to understand the identities

amistre64 · Answer

which ones?  there are the pythag ids, and some double/half angles that are basic ...

amistre64 · Answer

sin^2 + cos^2 = 1

divide by sin,  and divide by cos

amistre64 · Answer

i use this for the sum of angles

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