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[" 10."int{1+tan x*tan(x+alpha)}dx=],[" ...

[" 10."int{1+tan x*tan(x+alpha)}dx=],[" 1) "cot alpha log|cot(x+alpha)|+c],[" 2) "cot alpha log|(cot(x+alpha))/(cos x)|+c],[" 3) "cot alpha log|(cos x)/(cos(x+alpha))|+c],[" 4) "cot alpha log|(sin x)/(cot(x+alpha))|+c]

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