tan of arccos(x)

https://en.wikipedia.org/wiki/Inverse_trigonometric_functions

설명 : http://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.612706.html

sqlite3 버젼

Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
>>> sqlite3.version
'2.6.0'
>>> sqlite3.sqlite_version
'3.6.21'
>>>