Represent the following family of curves by forming the correspo

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 Multiple Choice QuestionsShort Answer Type

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51. Represent the following family of curves by forming the corresponding differential equations (a. b: parameters).
straight x squared over straight a squared plus straight y squared over straight b squared space equals space 1




The equation of curve is
           straight x squared over straight a squared plus straight y squared over straight b squared space equals space 1                          ...(1)
Differentiating w.r.t., x successively two times, we get.
         fraction numerator 2 straight x over denominator straight a squared end fraction plus fraction numerator 2 yy subscript 1 over denominator straight b squared end fraction equals 0   or     straight x over straight a squared plus fraction numerator straight y space straight y subscript 1 over denominator straight b squared end fraction equals 0           ...(2)
rightwards double arrow space space space space space space space space space space space straight a squared over straight b squared equals space minus fraction numerator straight x over denominator straight y space straight y subscript 1 end fraction                                              ...(3)

and  1 over straight a squared plus fraction numerator straight y space straight y subscript 2 space plus space straight y subscript 1 superscript 2 over denominator space straight b squared end fraction space equals space 0 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow space space space straight a squared over straight b squared space equals space fraction numerator negative 1 over denominator straight y space straight y subscript 2 space plus space straight y subscript 1 squared end fraction     ...(4)
From (3), (4), we get, 
                       fraction numerator negative straight x over denominator straight y space straight y subscript 1 end fraction space equals space fraction numerator negative 1 over denominator straight y space straight y subscript 2 space plus space straight y subscript 1 squared end fraction space space space space space space rightwards double arrow space space space space straight x space left parenthesis straight y space straight y subscript 2 plus space straight y subscript 1 squared right parenthesis space minus space straight y space straight y subscript 1 space equals space 0
which is the required differential equation. 

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52. Represent the following family of curves by forming the corresponding differential equations (a. b: parameters).
straight x squared over straight a squared minus straight y squared over straight b squared space equals space 1




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53. Represent the following family of curves by forming the corresponding differential equations (a. b: parameters).
straight y squared minus 4 straight a left parenthesis straight x minus straight b right parenthesis





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54. Represent the following family of curves by forming the corresponding differential equations (a. b: parameters).
left parenthesis straight y minus straight b right parenthesis squared space equals space 4 left parenthesis straight x minus straight a right parenthesis






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55. Represent the following family of curves by forming the corresponding differential equations (a. b: parameters).
straight x squared plus straight y squared space equals space 2 ax







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56.

Find the differential equation that will represent the family of curves given by (a, b: parameter):
y = ax3

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57.

Find the differential equation that will represent the family of curves given by (a, b: parameter):
x2 + y2 = a x3

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58.

Find the differential equation that will represent the family of curves given by (a, b: parameter):
y = eax

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 Multiple Choice QuestionsLong Answer Type

59. Form the differential equation corresponding to y2 – 2 a y + x2 – a2 by eliminating a. 
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 Multiple Choice QuestionsShort Answer Type

60. Form the differential equation representing the family of curves y = a sin (x + b), where a and b are arbitrary constants.  
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