I tried to solve the following question :-

y = c1(t-c2)^2 and y = c(t-(1/c))^2

I got stuck at the substitution to write them in the form of y' and y''. Even after giving my best try I couldn't eliminate 't' from the expression.The answer is in the form of y and y'' for 1st and y' for 2nd My expression was all right except for that 't' thing. What technique and approach should I use for solving these type of questions?