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maym0Re97Best ResponseYou've already chosen the best response.1
by 2A do you mean 2x?
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
If that's the case, then your'e going to do arc cos of 4/11, which yields x, then plug that value of x into cos2x
 one year ago

rubyhunterBest ResponseYou've already chosen the best response.0
i dnt get ti can you walk me through it
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
ok so by 2A did you actually mean cos2x?
 one year ago

shubhamsrgBest ResponseYou've already chosen the best response.2
why dont you simply use this gem of a formulla : cos 2x = (2cos^2 x)  1 hope this helps..
 one year ago

rubyhunterBest ResponseYou've already chosen the best response.0
no it doesnt help CAUSE I DNT KNOW HOW TO DO IT :(
 one year ago

shubhamsrgBest ResponseYou've already chosen the best response.2
nevermind,,i cant help you further then :/
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
Ok so use your graphing calculator and there should be a button that's like cos, and right above it you'll see cos^1. Plug into your calcultar, cos^1(4/11), because what that's saying is cos of the whatever that is, is going to be 4/11. Now you have x. Now plug whatever you got for x back into your calculator.
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
Back into the equation cos2x.
 one year ago

rubyhunterBest ResponseYou've already chosen the best response.0
wait y am i doin cos1 instead of cos
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
because that's how you're going to find x. It's just like how if you had x^2=4, you'd find the square root of both sides. In this case you're getting rid of the cos.
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
ok, so is that what you're getting for cos^1(4/11)?
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
ok you have that value for x, now plug that in for x in cos2x. So plug in cos(2*68.67). That SHOULD be how you do it, I haven't done stuff like this in two years.
 one year ago

rubyhunterBest ResponseYou've already chosen the best response.0
so is it a .7353878608
 one year ago

maym0Re97Best ResponseYou've already chosen the best response.1
Yeah uhhhh that should be it, apologies if it isn't though, I don't have a calculator with me.
 one year ago

jishanBest ResponseYou've already chosen the best response.0
use to apply cos2x=cos^2xsin^2x cox=4/11 sinx=squareroot( 1cos^2x)
 one year ago
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