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∫ sec 2 x dx
∫ sec 2 2x dx
∫ sec 3 x dx
∫ e x 2 dx
∫x sec x tan x dx
∫1 x 2-a 2 dx
∫2 x dx
∫x 2 dx
∫sin x 2 dx
∫ x -12 *e -x dx
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