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S

s.u.m

\sum_{n+2}^x enclosed by double dollar is \(\sum_{n+2}^x\)

smiley

Try the code ~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1$\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}} enclosed by double dollar symbol to produce smiley.

square root

@@sqrt{x}@@  is \sqrt{x}

subscript

underscore x_2 enclosed by double dollar is \(x_2\)

superscript

\($x^2\)$ or \($x^3\)$ is \(x^2\) or \(x^3\)