Poll: How hard was it to *learn* SIN COS and TAN?
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7 100.00%
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0 0%
Total 7 vote(s) 100%
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Sin Cos and Tan (again)
#1
I know that I had posted this before, but I didn't get it at all. So could someone either, explain it to me considering that I don't know what SIN COS and TAN is, or send me a link to a tutorial, Math, or QB, that can tell me.
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#2
--/|
/-|
/--|
----

WarlordAgamemnus: pi r^2 = area of a circle
WarlordAgamemnus: 2pi r = circumference
WarlordAgamemnus: =)
WarlordAgamemnus: socatoah
WarlordAgamemnus: actually
WarlordAgamemnus: sohatoa
WarlordAgamemnus: no
WarlordAgamemnus: sohatoah
WarlordAgamemnus: ?
WarlordAgamemnus: sohcoahat?
WarlordAgamemnus: no
WarlordAgamemnus: sohcatoah
WarlordAgamemnus: yeah
WarlordAgamemnus: that is it

sine = opposite / hypotenuse
cosine = adjacent / opposite
tangent = adjacent / hypotenuse
Peace cannot be obtained without war. Why? If there is already peace, it is unnecessary for war. If there is no peace, there is already war."

Visit www.neobasic.net to see rubbish in all its finest.
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#3
An even more helpful post could be to show me how to draw a line that I can change it's angle with the simple change of a variable, while explaining to me what each variably does. I feel confident that this will help me a lot.
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#4
um ok

angles:
a
b
c
A
B
C
change the angle, change the line.
-|c --
A| -- C
-|a b--
--------
B

sin© = opp/hyp = B/C
cos© = adj/hyp = A/C
tan© = sin/cos = B/A = opp/adj
Code:
Something doesn't feel right here...

sin(b) = opp/hyp = A/C
cos(b) = adj/hyp = B/C
tan(b) = sin/cos = A/B = opp/adj

sin(a) = opp/hyp = ??
cos(a) = adj/hyp = ??
tan(a) = sin/cos = ??= opp/adj
Peace cannot be obtained without war. Why? If there is already peace, it is unnecessary for war. If there is no peace, there is already war."

Visit www.neobasic.net to see rubbish in all its finest.
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#5
about them without actually having something to do with them. (Or did I miss something?)
ravelling Curmudgeon
(geocities sites require copying and pasting URLs.)
I liked spam better when it was something that came in a can.
Windows should be defenestrated.
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#6
okay, sine/cosine/tangent are all part of a type of math called TRIGONOMETRY (tuh... nitpickers), which is pretty much angles and curves and junk. it's often taught with right triangles because they have special properties.

por ejemple:
[Image: righttri.gif]
your hypotenuse is the long side.
the other two sides are called your legs.

from now on, when we refer to angles, we use cap letters. when referring to sides we use lowercase. i didnt invent this, sorry Tongue

when we say sine of angle A [aka sin(A)] we're referring the leg facing that angle divided by the hypotenuse. or:

sin(A) = a / c (or sin(A) = opp / hyp)

for cosine, we divide the other leg (adjacent) by the hypotenuse:

cos(A) = b / c (cos(A) = adj / hyp)

for tangent, we are basically getting the slope of hypotenuse by saying

tan(A) = a / b (tan(A) = opp / adj)

WHAT THIS MEANS FOR YOU AS AN PROGRAMMER WHO ISNT DOING HEAVY MATHEMATICAL APPLICATIONS OF TRIGONOMETRY:

when you use qb's sin and cos, it basically gives you the length of the opposite and adjacent sides of the triangle if the hypotenenuse is 1. so if i want to say "okay! i want to draw this pixel 10 pixels away 30 degrees from here":

Code:
x = 160 ' coordinate
y = 160

degrees = 30
radians = degrees * pi / 180 'will explain later
length = 10

x2 = cos(radians) * length + x
y2 = sin(radians) * length + y

pset (x2, y2) ' will plot 10 pixels away from center at 30 degrees

obviously, this comes very much in handy when rotating things, or calculating positions, which is why you'll see it so much as a programmer. any time you're dealing with converting angles to coordinates, it'll come in handy as well.

you wont be dealing with this in depth until precalculus in high school, though you will grace the basics in geometry and algebra 2, so it's okay if you dont get all of it. i hope i explained the very, very, very simple basics of trigonometry to you well enough.
i]"I know what you're thinking. Did he fire six shots or only five? Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But being as this is a .44 Magnum ... you've got to ask yourself one question: 'Do I feel lucky?' Well, do ya punk?"[/i] - Dirty Harry
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#7
Some guy into economics was allowed to influence the "new math." Smile (Back in the dark ages, we called it "trigonometry.")
ravelling Curmudgeon
(geocities sites require copying and pasting URLs.)
I liked spam better when it was something that came in a can.
Windows should be defenestrated.
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#8
Ooooh, thanks Toonski, I have a better understanding of this than I did before. At least I actually know what SIN COS and TAN *are*. I can probably use them with basic commands.
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#9
hey, if my president can misunderestimate then i can study trigonomics Smile
i]"I know what you're thinking. Did he fire six shots or only five? Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But being as this is a .44 Magnum ... you've got to ask yourself one question: 'Do I feel lucky?' Well, do ya punk?"[/i] - Dirty Harry
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#10
.
ravelling Curmudgeon
(geocities sites require copying and pasting URLs.)
I liked spam better when it was something that came in a can.
Windows should be defenestrated.
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