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66 – get determinant of 4×4 matrix

65 – get determinant of 3×3 matrix

64 – get determinant of 2 x 2 matrix

63 – get compound annual growth rate

62 – get logarithm formula

61 – get compound interest formula

59 – get rectangular to polar formula

58 – get polar to rectangular formula

57 – get combination formula

56 – get permutation formula