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a² a^b |a| nth√ √ π sin cos tan sin⁻¹ cos⁻¹ tan⁻¹ mean stdev stdevp nPr nCr ! e^b nth√ e^x abs round ln log e π ( ) , 7 8 9 ÷ % a/b 4 5 6 × ← CE 1 2 3 − AC 0 . ans + ⌫ =