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[" 6."(cot^(2)theta-1)/(1-tan^(2)theta)=...

[" 6."(cot^(2)theta-1)/(1-tan^(2)theta)=cot^(2)theta],[" 7."((1+sin theta)^(2)+(1-sin theta)^(2))/(2cos^(2)theta)=(1+sin^(2)theta)/(1-sin^(2)theta)]

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