xy.yx=1 হলে dydx=?
A
-y(y+xlogy)x(ylogx+x)
B
-y(ylogx+x)x(xlogy+y)
C
-x(ylog+x)y(xlogy+y)
D
-x(Y+xlog y)y(y logx+x)
Correct Answer: -y(ylogx+x)x(xlogy+y)