F(x) = (1+x)/(1-x)
testOneDivX
Merge pull request #13 from Rafiki5/rafaliwko

testOneDivX
Merge branch 'master' into function

Conflicts:
	Tests/SimpleCalcTest.php
Merge pull request #11 from gajdaw2/function

F(x) = (1+x)/(1-x)
f($x) = ($x * $x + 1) / ($x - 1)