if y=tan^-1(√a-x/a+x) where -a<x<a then dy/dx=
1. x/√a^2-x^2
2. a/√a^2-x^2
3. -1/2√a^2-x^2
4. 1/2√a^2-x^2
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4 I think pls mark as brainliest
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