[" 68."(1+sin theta)/(1-sin theta)=],[["...

[" 68."(1+sin theta)/(1-sin theta)=],[[" (A) "tan((pi)/(4)+(theta)/(2))," (B) "tan^(2)((pi)/(4)+(theta)/(2))],[" (C) "cot^(2)((pi)/(4)+(theta)/(2))," (D) "cot^(2)((pi)/(4)+(theta)/(2))]]

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