Question

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

Answer 1

can you use the unit circle?

Answer 2

Yes I think you can, (something with leters "CAST" - I don't understand it)...
And please write detailed explanation, thanks :)

Answer 3

uniti cicle is cool because you just find the value for sin and then the value for cos is with it

Answer 4

i have no idea what CAST is

Answer 5

did that help?

Answer 6

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

Answer 7

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....

Answer 8

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

Answer 9

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

Answer 10

If sin is 1 than cos must be 0, that's why I'm confused