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- A_N = TAN^2((π *N)/(4* (N + 2)))
- 3 cot^2((π)/12)≈13.92820323027550 tan^2((π)/12)≈0.071796769724490742
- 4 cot^2(π/8)≈5.8284271247461
- 5 cot^2((3 π)/20)≈3.851839996319182
- 6 cot^2((π)/6)=3
- 7 cot^2((5 π)/28)≈2.532843230615688
- 8 cot^2((3 π)/16)≈2.239828808843550
- 9 cot^2((7 π)/36)≈2.03960672916147
- 10 cot^2((π)/5)≈1.89442719099991
- 11 cot^2((9 π)/44)≈1.78447814814636
- 12 cot^2((5 π)/24)≈1.6983963724170
- 13 cot^2((11 π)/52)≈1.629211495628917
- 14 cot^2((3 π)/14)≈1.572416528431
- 15 cot^2((13 π)/60)≈1.524970987218355
- 16 cot^2((7 π)/32)≈1.4847508418703
- 17 cot^2((15 π)/68)≈1.450228261611679
- 18 cot^2((2 π)/9)≈1.420276625461
- 19 cot^2((17 π)/76)≈1.3940472215425
- 20 cot^2((9 π)/40)≈1.370888706465
- 21 cot^2((19 π)/84)≈1.350292994004402
- 22 cot^2((5 π)/22)≈1.33185799317496
- 23 cot^2((21 π)/92)≈1.3152613845107677
- 24 cot^2((11 π)/48)≈1.300241803840
- 25 cot^2((23 π)/100)≈1.28658510503
- 26 cot^2((3 π)/13)≈1.27411417292
- 27 cot^2((25 π)/108)≈1.2626812613688
- 28 cot^2((13 π)/56)≈1.25216215588
- 29 cot^2((27 π)/116)≈1.24245167383
- 30 cot^2((7 π)/30)≈1.23346015809
- 31 cot^2((29 π)/124)≈1.225110717528
- 32 cot^2((15 π)/64)≈1.21733703535
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