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= cos (360-330)° + sin (270-225)° - tan (180-135)°
= cos 30° + sin 45° - tan 45°
= √3 per 2 + √2 per 2 - 1
= √3 + √2 per 2 - 1
atau bisa lebih disederhanakan lagi
= √3 + √2 - 2 (dikali 2)
Semoga bermanfaat! Maaf ya kalo salah.