Curve sketching pad — plot a function and read off its key features

Type y = f(x) and the curve appears with everything an O-Level / JC sketch must show: x- and y-intercepts, turning points, stationary inflexions, and vertical / horizontal asymptotes. Use ^ for powers — e.g. x^2−4, (x^2−1)/(x−2), sin(x). ln is log base e; log is base 10.