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Cos 4卷

灼眼的夏娜

1 AU B={1,2,3,4} 则CU(AUB)=空集 2 COS330=COS(360-30)=cos30=二分之根号三

解 ∵a∈(π/4,π/2) ∴sina>cosa ∴cosa-sina

Y1=1/2(d-2t)cos22.5°=0.4619(d-2t)Y2=1/2(d-2t)cos45°=0.3536(d-2t)Y3=1/2(d-2t)cos67.5°=0.1913(d-2t)Y4=1/2(d-2t)cos90°...

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