matlab 计算结果用 matlab 算积分： syms x f = cos ( x ) / ( x ^ 2 + 4 ) ^ 2f =cos(x)/(x^2+4)^2 a = int ( f ,0 ,199 )a =-1/16*sinh(2)*pi+1/32*cosh(2)*pi-1/32*i*cosint(199-2*i)*cosh(2)+199/316840*cos(199)+1/32*i*
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>> clear>> syms xf = cos ( x ) / ( x ^ 2 + 4 ) ^ 2;
>> a = int ( f , 0 , inf )
a =(3*pi)/(32*exp(2))
函数积分,0到正无穷,算出来好像不是0