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If y=1/(sqrt(a^2-b^2))cos^(- 1)((acosx+b...

If `y=1/(sqrt(a^2-b^2))cos^(- 1)((acosx+b)/(a+bcosx)),` then `(d^2y)/(dx^2)=` (i) `(bsinx)/(a+bcosx)^2` (ii) `-(bsinx)/(a+bcosx)^2` (iii) `(bcosx)/(a+bcosx)^2` (iii) `-(bcosx)/(a+bcosx)^2`

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