cos(-675°) sin330° tan135°-sin210° 求值
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cos(-675°) sin330° tan135°-sin210° 求值
![cos(-675°) sin330° tan135°-sin210° 求值](/uploads/image/z/19965324-12-4.jpg?t=cos%EF%BC%88-675%C2%B0%EF%BC%89+sin330%C2%B0+tan135%C2%B0-sin210%C2%B0+%E6%B1%82%E5%80%BC)
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[sin330°-tan(-13π/3)]/[cos(-19π/6)-cos690°]
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