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If y=a t^2+2b t+c&t=a x^2+2b x+c , then ...

If `y=a t^2+2b t+c&t=a x^2+2b x+c ,` then `(d^3y)/(dx^3)` equals `24 a^2(a t+b)` (b) `24 a(a x+b)^2` `24 a(a t+b)^2` (d) `24 a^2(a x+b)`

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