Operations15 constructor Null safety

1. jrpn
2. jrpn15.main
3. Operations15
4. Operations15 constructor

Operations15 class

1. Constructors
2. Operations15
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. cf
13. clearSigma
14. cos
15. cosh
16. coshInverse
17. cosInverse
18. cYX
19. deg
20. deltaPercent
21. dim
22. div
23. dse
24. eng
25. eX15
26. fix
27. fQuestion
28. fracOp
29. grd
30. gsb
31. gto
32. hyp
33. hypInverse
34. I15
35. integrate
36. intOp
37. isg
38. lbl15
39. letterLabelA
40. letterLabelB
41. letterLabelC
42. letterLabelD
43. letterLabelE
44. linearRegression
45. lnOp
46. logOp
47. lstx15
48. matrix
49. minus
50. mult
51. parenI15
52. percent
53. piOp
54. plus
55. pYX
56. rad
57. ranNum
58. rcl15
59. reciprocal15
60. reImSwap
61. resultOp
62. rnd
63. sci
64. sf
65. sigmaMinus
66. sigmaPlus
67. sin
68. sinh
69. sinhInverse
70. sinInverse
71. solve
72. sqrtOp15
73. stdDeviation
74. sto15
75. tan
76. tanh
77. tanhInverse
78. tanInverse
79. tenX15
80. testOp
81. toDeg
82. toH
83. toHMS
84. toP
85. toR
86. toRad
87. userOp
88. xBar
89. xEQ0_15
90. xExchange
91. xFactorial
92. xSquared
93. yHatR
94. yX15