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sin cos tan AC sin sin⁻¹ cos⁻¹ tan⁻¹ ( ) cos log ln √ π e tan x² x³ x^y x! 1/x |x| 7 8 9 ÷ DEG/RAD mod 4 5 6 × nCr 1 2 3 - MS nPr 0 . % + MR MC =