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不难只是我太水class="ikqb_img"src="http://c.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=e0cf99be0fd79123e

不难只是我太水 class="ikqb_img" src="http://c.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=e0cf99be0fd79123e0b59c729d0475ba/f3d3572c11dfa9eca05c9fa161d0f703918fc112.jpg" esrc="http://c.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=8b0b51b2
不难只是我太水
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不难只是我太水 class="ikqb_img" src="http://c.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=e0cf99be0fd79123e0b59c729d0475ba/f3d3572c11dfa9eca05c9fa161d0f703918fc112.jpg" esrc="http://c.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=8b0b51b2
6. ∫lntanx/(sinxcosx)dx
分子分母同除以cos²x
=∫sec²x*lntanx/tanx dx
=∫lntanx/tanx d(tanx)
=∫lntanxd(lntanx)
=(1/2)ln²(tanx)+C