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If f(x)=x/sqrt(a^2+x^2)-((d-x))/sqrt(b^2...

If `f(x)=x/sqrt(a^2+x^2)-((d-x))/sqrt(b^2+(d-x)^2)` then (A) `f(x)` is strictly increasing (B) `f(x)` is strictly deceasing (C) `f\'(x)` is constant (D) `f(x)` is neither increasing nor decreasing

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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAINS-All Questions
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