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.
Putin spoke about the many foreign crises in which Russia is entangled, commenting on Syria and Ukraine, as well as again lashing Turkey over its shooting down of a Russian bomber last month. PHOTO:Russian President Vladimir Putin speaks during his annual press conference on December 17, 2015 in Moscow.