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If x^2+y^2=1, then a. y y''-2(y^(prime)...

If `x^2+y^2=1`, then
a. `y y''-2(y^(prime))^2+1=0`
b. `yy''+(y^(prime))^2+1=0`
c. `yy''+(y^(prime))^(-2)-1=0`
d. `yy''+2(y^(prime))^2+1=0`

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