예제 0.6.2

저자:
Kyeongsik Choi(최경식)
(1) 풀기( cos( 2x - pi / 3 ) = sqrt( 3 ) / 2 ) (2) 풀기( cos( 2x + pi ) = 1 / 2 ) (3) 풀기( sin( 2x + pi / 2 ) = 1 / 2 ) (4) 풀기( sin( 3x - pi / 2 ) = sqrt( 3 ) / 2 )