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I fcos^(- 1)x/a+cos^(- 1)y/b=(5pi)/12and...

`I fcos^(- 1)x/a+cos^(- 1)y/b=(5pi)/12andsin^(- 1)x/a-sin^(- 1)y/b=pi/12t h e n(x^2)/(a^2)+(y^2)/(b^2)=1)12)1& sol43)3& sol4`

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