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discriminant((-s^2y+x^2y+y^3)Cos[A]+(-s^2x+2sx^2-x^3+2sy^2-xy^2)Sin[A], x)
discriminant((-s^2y+x^2y+y^3)Cos[A]+(-s^2x+2sx^2-x^3+2sy^2-xy^2)Sin[A], x)
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