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.
â¢ For more on Crimea's unique relationship to Russia, click here. This week, pro-Moscow authorities have begun preparations for a referendum on the status of Crimea, to be held this Sunday, 16 March. The campaign for annexation of Crimea began as tensions over Ukraine's recent tumult rapidly mounted.