These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Russia formally signed a treaty to annex the breakaway Ukrainian region of Crimea in the face of sanctions leveled Monday by the U.S. and the European Union. Here are five reasons Russian President Vladimir Putin gave for why Russia moved to take Crimea back and what the world can expect now. 18 Mar 2014 9:37am.