Points A and B are specified by the position vectors a and b. Then what's the
equation of the plane bisecting the segment AB perpendicularly ?



Use the relationship e^iB = cosB+isinB to express cos5B in terms of cosB
Hence show that x = COS(Pi/10)
is a root of the equation 16x^4 -20x^2 + 5 = O


Find y(x) if y(Pi)=2pi and the derivative of f(x)-y/x=xcosx