Question

determine P(cos 225 degrees, sin 225 degrees). Then use those vaules to verify that x^2 = y^2 = 1

Answer 1

The cos of 225 and sin of 225 are both \[\frac{ \sqrt{2} }{ 2 }\], so if x = y, then x^2 must = y^2.

Answer 2

That square root is negative too.

Answer 3

x=cos225=cos(180+45)=-cos45=-1/sqrt2
y=sin225=sin(180+45)=-sin45=-1/sqrt2
x^2=1/2
y^2=1/2
x^1/2=y^1/2