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2.) 2sin1/6πcos1/6π
=> 2 * (sin1/6π) * (cos1/6π) (1/6π = 30°)
=> 2 * (1/2) * (1/2√3)
=> (1/2)√3
3.) sin(1/2π)*sin(1/3π)*sin(1/6π) (Kalau susah diubah dahulu ke bentuk derajat)
=> sin90 * sin60 * sin30
=> 1 * (1/2)√3 * (1/2)
=> (1/4)√3