Posted by **Anonymous** on Sunday, November 1, 2009 at 6:24pm.

Angles x and y are located in the first quadrant such that sinx=3/5 and cosy=5/13.

a) Determine an exact value for cosx

b) Determine an exact value for siny

- math -
**Quidditch**, Sunday, November 1, 2009 at 6:52pm
a)

let x = the x length

let y = the y length

let r = the length from the origin to the x,y point.

r^2 = x2 + y^2

sine of x = y/r

so y and r are given in the problem.

solve for x.

cosine of x = x/r

- math -
**Quidditch**, Sunday, November 1, 2009 at 6:53pm
In the explanation, the angle x and the x length are different items.

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