sin cos tan Deg Rad sin^-1 cos^-1 tan^-1 τ e x^y x³ x² e^x 10^x 1/x 3√x √x ln log ( ) 1/x % n! 7 8 9 + Back 4 5 6 - Ans 1 2 3 × M+ 0 . EXP / M- ± RND AC = MR