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Q.

The solution of dydx=(3x+y+4)2 is

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a

3x+y+4=3tan(3x+c)

b

3x+y+4=3tan(2x+c)

c

3x+y4=3tan(3x+c)

d

3x+y+4=3tan(x+c)

answer is C.

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Detailed Solution

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Given equation is dy/dx=(3x+y+4)2(1)

Put 3x+y+4=z. Then 3+dydx=dzdxdydx=dzdx3

(1)dzdx3=z2dzdx=z2+31z2+3dz=dx

1z2+3dz=dx13Tan1z3=x+c3Tan1z3=3x+c

z=3Tan(3x+c)3x+y+4=3Tan(3x+c)

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