为什么用matlab求这个积分算不出来啊 syms x; int(sqrt(1+pi^2*cos(x).^2),0,2)
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为什么用matlab求这个积分算不出来啊 syms x; int(sqrt(1+pi^2*cos(x).^2),0,2);
![为什么用matlab求这个积分算不出来啊 syms x; int(sqrt(1+pi^2*cos(x).^2),0,2)](/uploads/image/z/15109387-43-7.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%E7%94%A8matlab%E6%B1%82%E8%BF%99%E4%B8%AA%E7%A7%AF%E5%88%86%E7%AE%97%E4%B8%8D%E5%87%BA%E6%9D%A5%E5%95%8A+syms+x%3B+int%28sqrt%281%2Bpi%5E2%2Acos%28x%29.%5E2%29%2C0%2C2%29)
我这边有结果阿.
>> syms x; int(sqrt(1+pi^2*cos(x).^2),0,2);
>> y=int(sqrt(1+pi^2*cos(x).^2),0,2)
y=
1/8388608*3059521645650671^(1/2)*EllipticE(1/3059521645650671*8499493916249719503250543500065^(1/2))-1/16777216*3059521645650671^(1/2)*EllipticE((1-cos(2)^2)^(1/2),1/3059521645650671*8499493916249719503250543500065^(1/2))
>> y=double(y)
y =
4.1539
>>
再问: 额,不是吧
>> syms x; int(sqrt(1+pi^2*cos(x).^2),0,2);
>> y=int(sqrt(1+pi^2*cos(x).^2),0,2)
y=
1/8388608*3059521645650671^(1/2)*EllipticE(1/3059521645650671*8499493916249719503250543500065^(1/2))-1/16777216*3059521645650671^(1/2)*EllipticE((1-cos(2)^2)^(1/2),1/3059521645650671*8499493916249719503250543500065^(1/2))
>> y=double(y)
y =
4.1539
>>
再问: 额,不是吧
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