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x D sin L sin x 1 + ... + n π 2 0.123 1,000,000 2.1e10 0xFFEF MCMLXIX twenty one 2 + 3 1 2 π + < <= ++ .NOT. and + ( a + b ) [0,1) [ 0 , 1 ) f(x,y) f ( x , y ) x y f ( x ) sin x m 1 2 x ( _ a b ) ( a b ) x maps to y Theorem 1:      /* a comment */ there exists δ > 0 such that f ( x ) < 1 x 2 x 2 + = 2 x + y - z ( x , y ) ( a b ) a b c d 1 x 3 + x 3 = 1 x 3 + x 3 1 + 5 2 ( a b ) ( a b ) 1 + 5 2 Unrecognized element: mfraction; arguments were: 1 + 5 and 2 ... ... ... ... ... ... ... ... ... C | C | x + y + z x + y + z x + y + z x + y + z arg#1 ... arg#n opening-fence arg#1 sep#1 ... sep#(n-1) arg#n closing-fence opening-fence arg#1 closing-fence opening-fence closing-fence x + y + z a + b 0 1 f x y 10 131 1413 131 _ 3 103 a n i