a²b²/(a²sin²θ+b²cos²θ)+{a²b²(b²－a²)²sin²(θ)cos²(θ)/(a²sin²θ+b²cos²θ)³a²b²/(a²sin²θ+b²cos²θ)+{a²b²(b²－a²)²sin²(θ)cos²(θ)/(a²sin²θ+b²cos²θ)³

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