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∫ (1+cos^2 x)/cos^2 x dx =
我的算法:∫ (1+cos^2 x)/cos^2 x dx = 1/cos^2 x + 1 = 2/(cos2x +1 ) + 1 = 2(cos2x+1)^-1 +1=这么变成了 2(cos2x+1)^0/(0) 不对啊 ==
人气:369 ℃ 时间:2020-05-13 12:31:30
解答
∫ (1+cos^2 x)/cos^2 x dx =∫1/cos^2 x + 1dx
=∫1/cos^2 xdx+x
=∫1d(tanx)+x
=tanx+x+c
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