Descartes' Rule of Signs explained by an IITian 23 Feb 2017 This explanation of Descartes' Rule of Signs was submitted by Ayush, a HashLearn tutor from IIT, Dhanbad. Consider a polynomial equation p(x)=0 (descending powers of x) i) Number of positive roots of the equation p(x)=0 cannot…

Study Tips: Integral of sec(x).cosec(x) 21 Feb 2017 This tip on integration was contributed by one of our top tutors, Shashwat. Following up on our tips on calculus, this week we will explain the trick to finding the integral of the aforementioned function. Want more tips like this?…

Study Tips: Maxima and Minima 18 Feb 2017 This tip on calculus was contributed by one of our top tutors, Darshan Maheshwari. The last edition of study tips, we posted an interesting trick to differentiate an infinite series. This time we're following it up with helpful formulae to…