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sin cos tan DEG AC sin^-1 cos^-1 tan^-1 π e x^y x³ x² e^x 10^{x y}√x ³√x √x ln log ( ) 1/x % x! 7 8 9 ÷ ⌫ 4 5 6 × CE 1 2 3 - ± 0 . EXP + =