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S

s.u.m

$$\sum_{n+2}^x$$  is  \sum_{n+2}^x

smiley

$$~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1$\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$$  is ~\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)}}

square root

@@@sqrt{x}@@@  is @@sqrt(x)@@

subscript

underscore $$x_2$$  is   x_2

superscript

$$x^2$$ or $$x^3$$ is x^2 or x^3