What is the standard equation of a hyperbola with a center at (h,k), a horizontal transverse axis of length 2a, and a vertical conjugate axis of length 2b?
+
What is the period of the trigonometric function f(x) = 3*cos(2x) + 2*sin(4x) - tan(x)?
+
What is the limit as x approaches 0 of (e^x - 1)/(x^3)?