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atau
sin 150°- cos 210°+ tan 315°= 0.5-0.8+(-1)= -1.3
semoga benar
= 1/2 - (-¹/₂√3) + (-1)
=1/2 + ¹/₂√3 - 1
= -1/2 + ¹/₂√3
terimakasih, semoga membantu