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[" 49."(1+tan^(2)A)/(1+cot^(2)A)=],[[" (...

[" 49."(1+tan^(2)A)/(1+cot^(2)A)=],[[" (a) "sec^(2)A," (b) "-1," (c) "cot^(2)A," (d) "tan^(2)A]]

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