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sinA=(sprt(3)/2), find two values for cosA without using calculator (x is from 0 do 360 degrees)
 one year ago
 one year ago
sinA=(sprt(3)/2), find two values for cosA without using calculator (x is from 0 do 360 degrees)
 one year ago
 one year ago

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rachelfreak123Best ResponseYou've already chosen the best response.2
can you use the unit circle?
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
Yes I think you can, (something with leters "CAST"  I don't understand it)... And please write detailed explanation, thanks :)
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
uniti cicle is cool because you just find the value for sin and then the value for cos is with it
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
i have no idea what CAST is
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
Yes it helped for this example, but I still don't know how to the others... For example: If tanA=1/sqrt(3) find 2 values for cosA
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
well if it is for other than sin or cos you have to use SOH CAH TOA to find the lenghts of the sides of the triangle all trig crap comes back to triangles....
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
Yes, and I use TOA so which leads me to tanX=sinX/cosX In this example sinA=1 and cosA=sqrt(3) which is, I think not possible
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
well TOA tells you that the opposite side of the triangle is 1 and the ajacent is root 3, so you just need to find the hypot to figure cos
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
dw:1358706797888:dw
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
If sin is 1 than cos must be 0, that's why I'm confused
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
dw:1358706898345:dw
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
you do not really need the circle part, just a triangle
 one year ago

rachelfreak123Best ResponseYou've already chosen the best response.2
the circle would giev you the sign, but atht is uaully just pos and neg
 one year ago

phiBest ResponseYou've already chosen the best response.0
If sin is 1 than cos must be 0, that's why I'm confused that is true for the unit circle where the radius is 1 but if you are given tan A = \(\frac{1}{\sqrt{3}}\) it is easier to say the leg of the opposite side is 1 and the adjacent side is sqrt(3) and figure out the hypotenuse (radius) using pythagoras
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
I get the right result +sprt(3)/2... Thanks, but I'm not sure I understand it clearly yet, I'll try more examples and if I have troubles I'll post :)
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
Oh yes, radius doesn't have to be 1, you're right :) Thanks phi
 one year ago

phiBest ResponseYou've already chosen the best response.0
I always do these problems using pythagoras to figure out the missing 3rd side. then soh cah toa to get the trig function they want. you can get 2 different values based on whether x is + or  and y is + or 
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
dw:1358707405927:dw That's how it should look on a circle?
 one year ago

phiBest ResponseYou've already chosen the best response.0
btw, cast is just a way to remember which quadrant a trig function is positive See http://mathonweb.com/help_ebook/html/cast.htm but I never need it: I just look at the sign of the x and y values
 one year ago

phiBest ResponseYou've already chosen the best response.0
Yes to your picture notice you will get a positive 1/sqrt(3) if you started with 1/sqrt(3) (that would give you the other angle or CAST (see link) tells you that tan is + is the 3rd quadrant
 one year ago

nickersiaBest ResponseYou've already chosen the best response.0
Thanks for tips :) Oh, I understand now what it is :D actually you're right, it's not needed, just need to know the coordinates and that sin is on yaxis and cos on xaxis... Thanks a lot, I'm gonna do the rest of the questions :)
 one year ago
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