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If t a ntheta/2=sqrt((1-e)/(1+e))tanalph...

If `t a ntheta/2=sqrt((1-e)/(1+e))tanalpha/2,t h e ncosalpha=` `1-ecos(costheta+e)` (b) `(1+ecostheta)/(costheta-e)` (c) `(1-ecostheta)/(costheta-e)` (d) `(costheta-e)/(1-ecostheta)`

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