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rhd92781 (686)

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Olaaa!! Perrrfect answer. 118  [166 rates]

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et 4x+y+1=z
diff both sides wrt x
4 +dy/dx =dz/dx
dy/dx = dz/dx-4
also dy/dx  = z2
 
so dz/dx  - 4 = z^2
or dz/(z2+4) = dx
integrt
1/2 tan-1(z^2+4) = x +c
put z=4x+y+1
 
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