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If y=(sqrt(a+x)-sqrt(a-x))/(sqrt(a+x)+...

If `y=(sqrt(a+x)-sqrt(a-x))/(sqrt(a+x)+sqrt(a-x))`,then `(dy)/(dx)`is equal to (a)`(a y)/(xsqrt(a^2-x^2))` (b) `(a y)/(sqrt(a^2-x^2))` (c)`(a y)/(xsqrt(a^2-x^2))` (d) none of these

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