计算:sin(-1665°)+cos(-330°)-tan1200°
计算[3/(sin^2)20°-[1/(cos^2)20°]+64(sin^2)20°
计算:sin(-1200°)·cos1230°+cos(-1020°)sin(-1050°)+tan1305°
计算:sin²30°+cos²45°+根号2sin60°×tan45°
数学三角函数计算sin(a)*cos(a)=1/8,45°<a<90°,求cos(a)-sin(a)的值
sin,cos怎么计算
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已知tanα=2,计算:[sin(90°+α)-cos(180°-α)]/[sin(90°-α)-sin(180°-α)
sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°)
(cos 45°-sin 30°)/(cos 45°+sin 30°)
Cos(180°+α)*sin(α+360°)/sin(-α-180°)*cos(-180°-α)
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计算值 COS(-2040°)