2016/9/14に行われた Gaiaxグループ社内勉強会 で発表したトークのスライドです。

1. OGATA Tetsuji (@xtetsuji)
2016/09/14 Gaiax
https://flic.kr/p/9R7KgP

2. • / / OGATA Tetsuji
• @xtetsuji
• Blog: http://post.tetsuji.jp/
• RND

3. • DevOps PaaS
• OS
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•

4. Traditional Infra Engineer

5. Traditional Infra Engineer
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• Linux
• OS
•

6. It is Japanese traditional
•
What is this?
Japanese traditional

7. Japanese traditional

10. http://togetter.com/li/1018122

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• 1
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12. http://post.tetsuji.jp/2016/08/question-what-is-math-useful/

14. 2

15. • 2
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• 1

21. •
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2 OK
a
sin A
=
b
sin B
=
c
sin C
= 2R
c2
= a2
+ b2
2ab cos C

22. •
•
•
•
sin( ✓) = sin ✓
cos( ✓) = cos ✓
tan ✓ =
sin ✓
cos ✓
cos2
✓ + sin2
✓ = 1

23. •
•
•
•
sin ✓ = x () arcsin x = ✓
cos ✓ = x () arccos x = ✓

24. …

26. •
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•
sin(↵ ± ) = sin ↵ cos ± cos ↵ sin
cos(↵ ± ) = cos ↵ cos ⌥ sin ↵ sin

31. • 1999
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32. •

34. •
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•
2

35. •
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37. •
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•
cos(a ± b) = cos a cos b ⌥ sin a sin b
sin(a ± b) = sin a cos b ± cos a sin b

39. •
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42. •
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43. z = cos ↵ + i sin ↵
w = cos + i sin
wz = (cos ↵ + i sin ↵)(cos + i sin )
= cos(↵ + ) + i sin(↵ + )

44. T =
✓
cos sin
sin cos
◆
z =
✓
cos ↵
sin ↵
◆
Tz =
✓
cos ↵ cos sin ↵ sin
sin ↵ cos + cos ↵ sin
◆
=
✓
cos(↵ + )
sin(↵ + )
◆

45. •

47. •
•
•
• x
•
eix
= cos x + i sin x

48. • sin cos
•
•
•
cos x =
eix
+ e ix
2
sin x =
eix
e ix
2i
cos(↵ + ), sin(↵ + )

49. •
• 1
•

50. • sin, cos n
• sin, cos n
• sin 1
lim
h!0
sin(x + h) sin x
h

51. lim
h!0
sin(x + h) sin x
h

53. • 1 sin(x + h)
•
•

56. •
•
• sin(x)f 1
(x)f(x) =
Z x
0
dt
p
1 t2

58. •
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•

59. …

60. •
• sin(x)
•
• …

61. • e^ix

63. •
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64. •
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65. •
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• GPS Pokémon GO

66. •
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68. • TIE = Traditional Infra Engineer
•