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sin45°﹣|﹣2|﹣+(﹣1)2019
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计算﹣12014+|﹣|﹣sin45°.
计算﹣20+﹣12014+﹣sin45°
2cos30°﹣|1﹣tan60°|+tan45°•sin45°.
计算2﹣1﹣π﹣20120+sin45°.
Sin600tan300+︱sin450-1︱+tan600tan4500
20170﹣|﹣sin45°|cos45°+﹣﹣﹣1
+sin45°cos45°.
tan45°sin45°﹣2sin30°cos45°+tan30°=
sin45sin30°+cos60°+tan45°=
计算sin45°tan30°=.
sin
2
60°+cos
2
60°=1
sin30°+cos30°=1
sin60°=cos30°
tan45°>sin45°
有一个5P20x1045°的探头有机玻璃楔块内声速为2730m/s被检材料碳钢中的 声速为3230m
sinα=(3230/2730)·sin45°
α=sin-1(3230/2730)·sin45°
tgα=(3230/2730)·Sin45°
下列结论中正确的有①sin30°+sin30°=sin60°②sin45°=cos45°③cos25
为锐角,且sinA.=cos28°,则∠A.=62°. A.1个
2个
3个
4个
有一个5MHz20x1045°的斜探头有机玻璃楔块内的声速为2700米/秒被检材料钢 中的声速为32
sinα=(3230/2700)sin45°
tgα=(2700/3230)sin45°
α=sin-1[(2700/3230)tg45°]
α=sin-1[(2700/3230)sin45°]
计算:+﹣sin45°
因为sin30°=sin210°=所以sin210°=sin180°+30°=﹣sin30°因为si
计算sin45°.
sin²60°+cos²60°=1
sin30°+cos30°=1
sin35°=cos55°
tan45°>sin45°
计算sin45°-sin60°-2tan45°.
计算sin45°+sin60°-2cos45°
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