Maths - Pure A-Level Edexcel Study Guide Questions And Correct Answers

What is the order of a periodic sequence that goes 3,5,3,5,3,5,3,5,3,5...? {Ans: 2}What is a kite? {Ans: A quadrilateral where 2 sides are the same length and the other two are also the same length.}What is the reciprical of cosx? {Ans: secx}How do you get a quadratic nth term from a series? {Ans: Original sequence - second difference sequence. Then normal nth term after. a=half second difference b and c are formula of other sequence.}How would we say lnx and e^x are related? {Ans: Inverse of one another (reflected in y=x)}How would you go from x^2 + y^2 - 6x + 2y + 9 = 0 to something useful? {Ans: Complete the square: x^2 + y^2 - 6x + 2y + 9 = 0 = x^2 - 6x + y^2 + 2y + 9 = (x-3)^2 - 9 + (y+1)^2 + 9 (x-3)^2 + (y+1)^2 = 1}What is a perpendicular bisector? {Ans: A line perpednicular to a chord between two points that passes through its midpoint.}What is tan2x simplified? {Ans: 2tanx/(1-tan^2x)}How would I find a point of inflection. {Ans: Find when second derivative = 0 Then check either side of it