y=2/root(a^2-b^2)arc tan(a-b/a+b tan(x/2)), a>b>0, then (a) y1=-1/(a+bcosx) (b) y2=bsinx/(a+bcosx)^2 (c) y1= 1/(a-bcosx) (d) y2=-bsinx/(a-bcosx)^2

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