Name: Eric Who is asking: Student Level: All
Question: sin3x cos3x _____  _____ = 2 sinx cosx x = the variable Hi Eric,If you know the formulas for sin 3x and cos 3x, then it's easy. You can work the formulas out for yourself. Use sin(a+b) = sin(a)cos(b) + cos(a)sin(b) cos(a+b) = cos(a)cos(b)  sin(a)sin(b) with 3x = 2x + x. Chris
