Grade 12th passDifferential Calculus
if z f(x,y) where x=u-av,y=u+av prove that a^2d^2z/du^2-d^2z/dv^2=4a^2d^2z/dxdy
if z f(x,y) where x=u-av,y=u+av prove that a^2d^2z/du^2-d^2z/dv^2=4a^2d^2z/dxdy
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Yogendra Kumar
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