If x/a cosθ+ Y/b sinθ=1,x/asinθ−y/bcosθ=1, then prove that X^2/a^2+y^2/b^2=2

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If x/a cosθ+ Y/b sinθ=1,x/asinθ−y/bcosθ=1, then prove that X^2/a^2+y^2/b^2=2.
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