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= sin 240° + 2 .( - cos 45° ) - tan 135°
= sin (180° + 60°) + 2 . (-cos 45°) - tan (90 + 45)
= -sin 60° + 2 . ( - cos 45°) - cotan 45
= -1/2 + 2 . (- 1/2) - 1
= -1/2 - - 1