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81. Form the differential equation of the family of circles having centre on x-axis and radius 3 units.

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82. Find the differential equation of all the circles in the first quadrant which touch the co-ordinate axes.

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83. Form the differential equation of the family of circles in the second quadrant and touching the coordinate axes.

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84. Form the differential equation of the family of circles touching the x-axis at origin.

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85. Form the differential equation of the family of circles touching the y-axis at origin.

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86. Form the differential equation of the family of parabolas having vertex at origin and axis along positive direction of x-axis.

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87. Form the differential equation of the family of parabolas having vertex at origin and axis along positive direction of y-axis.

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88. Form the differential equation representing the family of ellipses having foci on x-axis and centre at the origin.

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89. Form the differential equation of the family of ellipses having foci on y-axis and centre at origin.

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90. Form the differential equation of the family of hyperbolas having foci on x-axis and centre at origin.

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