1.) sin2x=3cos2 2.) (3tan2x-1)(tan2x-3)=0 3.) cos3x=cosx 4.) 3tan3x=tanx Those were a few of the problems in the section I missed on friday due to illness and I was wondering if anyone could walk me through them. Would be greatly appreciated! They want to solve the equation for 0<=x<2pie for #1 and #2. and Find all solutions of the equation in the interval [0,2pie) algebraically for #3 and #4. Oh and could anyone tell me how to make the symbols for pie, square root, and greater than or equal to for future reference?