cos 120° + sin 210
tan 245° - cosec 45° berapa hasinyaa? please..bantu dong
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sin 210= -1/2
tan 245 gak ada adanya 240= √3
cosec (kebalikan dari sin) =√2
-1/2 -1/2÷ √3-√2
= -1 ÷ √3-√2