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I can't seem to get the "+" symbol to appear:

<img src="https://render.githubusercontent.com/render/math?math={\color{black} \large \sigma = f(\mu) = a\mu^2 + b\mu + c} ">   Eqn(2)

It is giving me this wrong result. The appearance I desire is this correct appearance.

1 Answers1

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Quoting a comment by @Jishan in this answer

Anyone using this method, because + is an escape character in URI, use %2B to render +.