how do you put these in a fraction or square root???
can someone tell me how?
Stacey Warren - Expert brainly.com
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I thought so :) at my age you can never be to sure tho...
i dont get why you sqrt it tho :S
and whats the cos(3*90) and why did you put something about y axis?
Q= quadrant that it ends up in which is important in order to determine whether or not the answer is a positive or negative.
The cosine funtion actually tells you the value of the x coordinate. At 270 degrees you are pointing straight down on the y axis and x=0 so cos(90)-straight up, or cos(270)-straight dwon, equals 0.
lol... "sqrt" is how I do square root :)
i know its the square root but why did you have to do that?
It is the definition of sin and cos. If you draw a right triangle with a 60 degree angle and a 30 degree angle you end up with a hypotenuse of (2) and a leg that is equal to (1).
If we use the pythagorean theorum; x^2 + y^2 = r^2 we can find the length of the other leg.
x^2 + (1)^2 = (2)^2
x^2 +1 = 4
x^2 = 4-1
x^2 = 3 ; sqrt both sides
That is it in a nutshell. It is just what happens when trying to figure out the measurements of a triangle.
Sin = opposite leg/hypotenuse; sin(60) = sqrt(3)/2
Same thing for cosine; which is adjacent leg/hypotenuse for any given right triangle.