math
posted by Anonymous .
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

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 
In the explanation, the angle x and the x length are different items.
Respond to this Question
Similar Questions

trig
Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5. a) Determine an exact value for cosx b) Determine an exact value for siny 
advanced functions
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. 
trig
Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5. a) Determine an exact value for cosx b) Determine an exact value for siny 
Math
Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5, determine and exact value for cos (x+y). I have no idea how to even start this question. Could someone please help me? 
Urgent
draw an angle x in the 1st quadrant with sinx=3/5, and an angle y in the 2nd quadrant with cosy=12/13, then determine the exact value of tan(x+y). 
pre calc
Find the exact value of sin(xy) if sinx=3/5 in Quadrant III and cosy=5/13 in Quadrant I. 
Math
22.Angles A and B are located in the first quadrant. If and , determine the exact value of . How do I get 16/65? 
Math
Angles A and B are located in the first quadrant. If sin a =5/13 and cos b= 3/5 , determine the exact value of cos (a+b) . 
Math
How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form of 1/2(sin2x + sin2y)? 
PreCal
[Note: This one... is super hard for me :( I really need help. please. I only have 2 hours left and I have no idea what I'm doing!! Suppose that cosx= 3/5 and x is in the third quadrant, and that siny= 2/9 and y is in the second quadrant. …