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IF $I_n=\int \limits_0^{\frac{\pi}{4}} \tan ^n x dx, $ then $I_2+I_4, I_3+I_5,I_4+I_6,$......... are in :

(1) arithmetic progression (2) geometric progression (3) harmonic progression (4) arithmetic- geometric progression
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(3) harmonic progression
answered Nov 7, 2013 by pady_1
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