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If f(x)=(a^(2)-b^(2))^(-1//2).cos^(-1)((...

If `f(x)=(a^(2)-b^(2))^(-1//2).cos^(-1)((acosx+b)/(a+bcosx)) a gt b gt 0 and 0 lt x lt pi`, then S.T `f'(x)=(a+bcosx)^(-1)`.

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