07-12.txt

《MATLAB简明教程》俺买的最新版的MATLAB教材

例7-12  使用simplify函数进行符号函数的简化。
解：在命令窗口中输入如下命令，并按Enter键确认。
>> syms x
>> fun1=(1/x+5/x^2+9/x+2)^(1/4)
 fun1 =
 (10/x+5/x^2+2)^(1/4)
>> sfy1=simplify(fun1)
 sfy1 =
 ((10*x+5+2*x^2)/x^2)^(1/4)
>>  sfy2=simplify(sfy1)
 sfy2 =
 ((10*x+5+2*x^2)/x^2)^(1/4)
>> simplify(sin(x)^2 + cos(x)^2)
 ans =
 1
>>