Answer by Mico for problem with "-" sign in equations
Some comments and suggestions:First and foremost, change $-$ to just -.Be careful where you place the \hat accents.Please check if it should ro and \theta o or, rather, r_0 and \theta_0. I suggest you...
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I need some help in this equation,this is the equation I've written, but it shows error missing \endgroup inserted. \begin{equation}\label{eq16}B=\frac{\frac{\hat{v_{ro}}}{\hat{v_{\theta o}}}\bigl[...
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