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If y=2/(sqrt (a^2-b^2)) tan ^-1 [(sqrt( ...

If `y=2/(sqrt (a^2-b^2))` `tan ^-1 [(sqrt( a-b)/(a+b)) tan x/2]`, show thatdy/dx= `1/(a+b cos x) and (d^2y)/(dx^2)= (bsinx)/((a+b scos x)^2)`

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A DAS GUPTA-Differentiation-Exercise
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