Posted by Abbey on Friday, April 16, 2010 at 2:58pm.
x^2+y^2= 1/cos^2 + sin^2/cos^2
=x^2( 1+sin^2)=x^2(2-cos^2)=
= x^2 (2-1/x^2)= 2x^2-1
or
y^2-x^2=-1
x^2-y^2=1
check all that
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