Doubt from differential equation

Question 2 all my circled ones 15732255804174635507305439017871

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I didnt need solution of this question i needed circles question and parabola question

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What about parabola question

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But order is 2 in answer key given in parabola question

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Question 7 and 915732743641152834814225645448938

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Question no 4 a part i did by taking h,k method but got wrong answer and question 5 second part i did by bernoullis method but got wrong answer 15734081287158040642093914143233 15734081801012953834887682155604

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Bro 4(a) is H.D.E already and 5th is linear Diffrential eq.

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Question 215734605038907051036695610314456

Question 4 b part also15734690763296660432902081110946

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Thanks

Pls check..Screenshot_2019-11-11-16-44-14