If `x=at^2, y=2at` then `(d^2y)/dx^2` is equal to

If x=a t^2,y=2a t , then (d^2y)/(dx^2) is equal to (a) -1/(t^2) (b) 1/(2a t^2) (c) -1/(t^3) (d) 1/(2a t^3)

If x=at^(2),y=2at then (d^(2)y)/(dx^(2)) is equal to

If x=at^(2),y=2at, then (d^(2)y)/(dx^(2)) is equal to ( a )-(1)/(t^(2))( b) (1)/(2at^(2))(c)-(1)/(t^(3)) (d) (1)/(2at^(3))

If y=Ae^(5x) , then (d^(2)y)/(dx^(2)) is equal to

If y=log (log x) then (d^2y)/(dx^2) is equal to

If y=log (log x) then (d^2y)/(dx^2) is equal to

If y=log(x+sqrt(x^2+a^2)) , then (d^2y)/(dx^2) is equal to

If y=log(x+sqrt(x^(2) +a^(2))) , then (d^(2)y)/(dx^(2)) , is equal to