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style='FONT-SIZE: 16px; FONT-FAMILY: arial, helvetica,sans-serif'>求旋转下列曲线所得的曲面的面积：y=tanx 0≤x≤π)绕轴Ox旋转 style='FONT-SIZE: 16px; FONT-FAMILY: arial, helvetica,sans-serif; WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; FLOAT: none; FONT-WEIGHT: normal; COLOR: rgb(51,51,51); FONT-STYLE: normal; ORPHANS: 2; WIDOWS: 2; DISPLAY: inline !important; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px'>所得旋转曲面的面积
s=2π ∫tanx（1+sec^4)^(1/2)dx 积分区间。
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