Theorem 3
General solution of tan q = k - Let a be the least positive angle, such that tan a = k . tan q = tan a . Also tan ( p + a ) = tan a = k. q = a or p + a = any other co-terminal angle q = a , 2 p + a , 4 p + a , . . . . . , p + 2 p + ( p + a ) . . ...