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.
(Laris Karklis/Washington Post). UPDATE, Tuesday, March 4: Putin defends actions in Ukraine. Ukrainians have been protesting since Nov. 21, when President Viktor Yanukovych rejected a deal for closer integration with the European Union, instead drawing the country closer to Russia.