DEG 2nd √ ³√ xⁿ AC sin cos tan sin⁻¹ cos⁻¹ tan⁻¹ log ln eˣ 10ˣ |x| 1/x x² x³ n! nPr nCr % π e ( ) DEL Ans 7 8 9 ÷ × ± 4 5 6 − + EXP 1 2 3 = 0 .