`(d^2x)/(d y^2)` equalsA. `-((d^(2)y)/(dx^(2)))((dy)/(dx))^(-3)`B. `((d^(2)y)/(dx^(2)))^(-1)`C. `-((d^(2)y)/(dx^(2)))^(-1)((dy)/(dx))^(-3)`D. `((d^(2)y)/(dx^(2)))((dy)/(dx))^(-2)`

`(d^2x)/(d y^2)` equalsA. `-((d^(2)y)/(dx^(2)))((dy)/(dx))^(-3)`B. `((

1.	`(d^2x)/(d y^2)` equalsA. `-((d^(2)y)/(dx^(2)))((dy)/(dx))^(-3)`B. `((d^(2)y)/(dx^(2)))^(-1)`C. `-((d^(2)y)/(dx^(2)))^(-1)((dy)/(dx))^(-3)`D. `((d^(2)y)/(dx^(2)))((dy)/(dx))^(-2)`
Answer» We have `(d^(2)x)/(dy^(2))=(d)/(dy)=((dx)/(dy))=(d)/(dy)(((1)/(dy))/(dx))cdot(dx)/(dy)` `=-(1)/(((dy)/(dx))^(2))cdot(d^(2)y)/(dx^(2))cdot(1)/(((dy)/(dx)))` `=-(1)/(((dy)/(dx))^(3))cdot(d^(2)y)/(dx^(2))` `=-((dy)/(dx))^(-3)((d^(2)y)/(dx^(2)))`

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