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Tan 210 = 1/akar3
Cos 315 = 1/2 akar2
Cosec 300 . Tan 210 . Cos 315 =
= -2/3 akar3 . 1/akar3 . 1/2akar2
= -2/3 . 1/2 akar2
= -2/6 akar2
semoga benar !!!