\( \sin ^{-1}\left(\frac{x^{2}}{4}+\frac{y^{2}}{9}\right)+\cos ^{-1}\left(\frac{x}{2 \sqrt{2}}+\...

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\( \sin ^{-1}\left(\frac{x^{2}}{4}+\frac{y^{2}}{9}\right)+\cos ^{-1}\left(\frac{x}{2 \sqrt{2}}+\frac{y}{3 \sqrt{2}}-2\right) \) equals to :
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