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If x^n+y^n=a^n , then frac{dy}{dx}= a....

If `x^n+y^n=a^n` , then `frac{dy}{dx}=`
a. `-frac{x}{y}`
b. `-frac{x^n}{y^n}`
c. `-frac{x^(n-1)}{y^(n-1)}`
d. `frac{y}{x}`

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