Homework Help Forum: Math Trig

Posted by John on Wednesday, October 28, 2009 at 10:49pm.

At what two points on the unit circle is the x-coordinate equal to the y-coordinate? Hint:Use the equation for the unit circle (x^2+y^2=1) but this time, replace y with x.

• Math Trig - Reiny, Wednesday, October 28, 2009 at 11:27pm

  so you would get x^2 + x^2 = 1 2x^2 = 1 x^2 = 1/2 or x = 1/±√2 or √2/2 after rationalized then y = √2/2 so the two points would be (√2/2,√2/2) and (-√2/2,-√2/2)

  
  

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