Maths-
General
Easy

Question

Which one of the following is a differential equation of the family of curves y equals A e to the power of 2 x end exponent plus B e to the power of negative 2 x end exponent

  1. fraction numerator d to the power of 2 end exponent y over denominator d x to the power of 2 end exponent end fraction minus 2 fraction numerator d y over denominator d x end fraction plus 2 y equals 0    
  2. x fraction numerator d to the power of 2 end exponent y over denominator d x to the power of 2 end exponent end fraction plus 2 fraction numerator d y over denominator d x end fraction minus x y plus x to the power of 2 end exponent minus 2 equals 0    
  3. fraction numerator d to the power of 2 end exponent y over denominator d x to the power of 2 end exponent end fraction equals 4 y    
  4. left parenthesis fraction numerator d y over denominator d x end fraction right parenthesis to the power of 3 end exponent equals 4 y left parenthesis x fraction numerator d y over denominator d x end fraction minus 2 y right parenthesis    

hintHint:

Differentiate two times to find the correct option.

The correct answer is: fraction numerator d to the power of 2 end exponent y over denominator d x to the power of 2 end exponent end fraction equals 4 y


    y equals A e to the power of 2 x end exponent plus B e to the power of negative 2 x end exponent
D i f f e r e n t i a t i n g space f o r space t h e space f i r s t space t i m e comma
fraction numerator d y over denominator d x end fraction equals 2 A e to the power of 2 x end exponent minus 2 B e to the power of negative 2 x end exponent
fraction numerator d y over denominator d x end fraction equals 2 left parenthesis A e to the power of 2 x end exponent minus B e to the power of negative 2 x end exponent right parenthesis
    D i f f e r e n t i a t i n g space f o r space t h e space s e c o n d space t i m e comma
fraction numerator d squared y over denominator d x squared end fraction equals 4 A e to the power of 2 x end exponent plus 4 B e to the power of negative 2 x end exponent
fraction numerator d squared y over denominator d x squared end fraction equals 4 left parenthesis A e to the power of 2 x end exponent plus B e to the power of negative 2 x end exponent right parenthesis
equals 4 y
    Hence, the correct answer is option (c).

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