tan inverse (x-1/x+1)+tan inverse(x+1/x+2)=pi/4 solve for x
Question
The circle X^2 y^2 4x-7y 12=0 cuts an intercept on y axis of length
If a,b and c are three vectors such that each one is perpendicular to the vector obtained by sum of the other two and |a|=3, |b|=4 and |c|=5, then prove that |a+b+c|=5
A speak truth in 75% of the cases, while B in 90% of the cases. in what percent of cases are they likely to contradict each other in starting the same fact