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예제 0.6.2

Author:Kyeongsik Choi
(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 )

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