i don't know the first thing about trigenometry. i dont even know if i spelled it right!! i just got my ARRL book, and its learnin' me about impedance matching, and little did i know that i'd need a knowledge of trig to accomplish this
wut i need is to know just enuf trig to get me by . . . i no theres gotta be a good website out there that'll teach me just enuf 2 get me by :lol:
Most of us learn it in the classrooms. As for you, I guess just grab any mathematics text. It's basically everywhere. For impedence matching, trigo is the small picture. You would need to know complex numbers in the larger context.
I didnt learn it until my senior year of high school, and boy was I behind when I got to college. I just took an algebra course and then I jumped to calc 1 though.
The basic definition of sin and cos is farily easy to understand. Think of a clock with a hour hand. Lets call 12:00 0 degrees and make the hour arm 1 foot long. At 12:00 the X-coordinate of the pointer is 0 and the Y-coordinate of the pointer is 1 foot. As the hour hand moves around clockwise the X and Y coordinates of the pointer end change - by 3:00 the X coord is 1 foot and the Y coord is 0. The sin and cos let you calculate the X and Y coordinate of the end of the pointer at each angle as it travels around. Try punching in the two known values into your calculator - for 12:00 (0 degrees): sin (0) = 0 and cos(0) = 1 for 3:00 (90 degrees) sin(90) = 1 and cos(90) = 0. At 45 degrees the sin and cos are equal.
If these values don't work your calculator probably is using Radians. Radians are just a different way to measure angle that makes the trig math a bit easier. 2pi radians = 360 degrees. So 90 degrees = 1/2 pi.
If you plot out the x-coord (sin) of the clock hand as it moves around you'll find it makes a nice sin wave. Thats why you can talk about a sin wave having an angle - its just the angle of the clock pointer at that point in its rotation.
thanx everyone, give me a wile, im trying to digest this information . . .
none of my friends who r in 11th have had trig yet. i think america's skool systems suck. dont even get me started on the stupidity of their lagging behind, then realizing it, then PILING on the homework and PUSHING the poor kids :evil: