D/R MC MR M+ asin acos AC sin cos tan atan log ln DEL n! |x| ⌈x⌉ ⌊x⌋ x³ % ÷ 7 8 9 y√x ( ) × 4 5 6 xʸ √ π - 1 2 3 x² e RAN + 0 . MIX a/b =