Would really appreciate the working to any of these questions... I have such trouble with trig.
1. Given d2y/dx2 = 9sin3x, find y if there is a stat pt at (pi/2, 1) [how do you get to y from its double derivative?]
2. Find lim as x->0 : 1 - cos(2x)/x(squared) [how do you work with x when...