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x=a(secx+tanx)^2
x^2=(a^2)((secx+tanx)^4)
y=b(secx-tanx)^2
y^2=(b^2)((secx-tanx)^4)
(x^2)(y^2)=(a^2)((secx+tanx)^4)(b^2)((secx-tanx)^4)
=((ab)^2)((secx)^2-(tanx)^2)^4
=((ab)^2)(1^4)
=((ab)^2)
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