∫\intop∫ (10x3-2sec2(x))dx = ∫\intop∫ (10x3-2/cos2(x))dx =∫\intop∫ 10x3dx -2∫\intop∫ 1/cos2(x))dx =
=2.5x4 -2sin(x)/cos(x) + C
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