It is more than likely that the 4x and 2x do not refer to quadruple and double angles but to the powers of tan. However, given the limitations of the browser it is impossible to be sure.
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either cos OR tan-sin equals zero socos=0 at pi/2 and 3pi/2ortan=sin which is impossibleim not sure though
theta = 0 is the only solution.
tan 2 pi = tan 360º = 0
pi/2
It just means that the value of 0 is equal to the value of 0, which is correct. It's like saying 2 equals 2, or 6 equals 6, or 52657 equals 52657... you get the point.