If x=asecA+btanA and y=atanA+bsecA then prove that x^2-y^2=a^2-b^2

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If x=asecA+btanA and y=atanA+bsecA then prove that x^2-y^2=a^2-b^2

x=atanA+bsecA and y=btanA+asecA then prove x2-y2=b2-a2
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