Adversity Testing MATLAB. Why does matlab say this?

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Seetha Rama Raju Sanapala
评论： David Young 2015-1-16
I give this command and get answer as below. What does this mean? I was simply doing adverstity testing of MATLAB.
syms x
s=solve(sin(x)^2 + cos(x)^2 == 1)
s =
C_

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David Young
David Young 2015-1-16
C_ is the set of complex numbers. That looks right, since the identity is true for any value of x.
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David Young
David Young 2015-1-16
Note that in my answer, C_ is a link to the documentation. I found it by Googling "matlab symbolic toolbox C_".

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