None of these

log ( 1 + y² ) = tan ^-1 x + c

None of these

tan ^-1 ( ^y/_x ) = log x + c

tan^-1 (^x/_y) = log x + c

tan ^-1 ( ^x/_y ) = log y + c

None of these

4xy = x⁴ + c

xy = x⁴ + c

4xy  - x⁴ + c 

None of these

y sin y = x² log x + x²/₂ + c

y cos y = x²  ( log x  + 1 ) + c

y cos y = x² log x + x²/₂ + c

y sin y = x² log x + c

tan ^{- 1} y

e ^{tan -1} y 

¹/ _{1 + y2}

¹/ _{x ( a + y2 )}

y = 5 ( 2 sinx - cos x ) + c e ^2x 

y = ( 2 sinx - cos x ) + ce ^-x

y =  ( 2 cos - sin x ) + ce ^{- 2x}

y = ¹/₅  ( 2 sinx - cos x ) + ce ^{- 2 x.}

xdv + ( 2v + V² ) dx = 0

vdx + (2x + x²) dv =0

V²dx - ( x + x2 ) dv = 0 

vdv + ( 2x + x² ) dx = 0

Log ^x/_y = cy

Log ^y/_x = cy

log ^x/_y = cx

lot ^y/_x = cx

(1 + y² ) (1 + x ² ) = cx²