Peon666 Messages 107 Reaction score 0 Thread starter Feb 8, 2010 #1 While seeing a signals example problem, I encountered this: cos^2 (wt+θ) = [1+cos(2wt+2θ)] What identity is this?
While seeing a signals example problem, I encountered this: cos^2 (wt+θ) = [1+cos(2wt+2θ)] What identity is this?
Doc Al Mentor Messages 45,589 Reaction score 2,473 Feb 8, 2010 #2 That doesn't seem right. Looks like they missed a factor of 2: cos(2x) = 2cos^2(x) - 1