WebQ. Mark ( ) against the correct answer 70% of students in a school are boys. If the number of girls is 240, how many boys are there in the school? (a) 420 (b) 560 (c) 630 (d) 480 Webclass 6. Maps Practical Geometry Separation of Substances Playing With Numbers India: Climate, Vegetation and Wildlife. class 7. Inside Our Earth Perimeter and Area Winds, Storms and Cyclones Struggles for Equality The Triangle and Its Properties. class 8.
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Web计箅cos42°cos18°-cos48°sin18°的结果等于( ). B.. C.. D.. 解题思路:由诱导公式和两角和的余弦可得原式=cos42°cos18°-sin42°sin18°=cos(42°+18°),计算可得.. 本题考点: 两角和与差的正弦函数.. WebClick here👆to get an answer to your question ️ cos12 cos24 cos36 cos48 cos72 cos96 equals. Solve Study Textbooks Guides. Join / Login. Question . cos 1 2 cos 2 4 cos 3 6 cos 4 8 cos 7 2 cos 9 6 equals. A. ... = − 1 6 1 c o s 3 6. c o s 7 2 = ... convert my resume to pdf
sin18°不用计算器怎么算? - 知乎
Web带入原计算式得. cos24°-sin6°-cos72°=0.5. 附:(补充). 以上的代数问题几何化只适用于此题. 因为解法中并没有计算出cos36 (或以及cos72)的数值;. 若有该项要求可采用以下方法:(不写具体过程了). 首先计算sin18: sin (2*18)=cos (3*18) 由三倍角公式. WebApr 10, 2024 · Q1. A 1.2 m tall girl spots a ballon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60°. Web组卷网为您提供初中数学人教版(2012)九年级下册 本章复习与测试中考模拟解答题精品习题、试题供老师进行组卷。组卷网初中数学人教版(2012)九年级下册 本章复习与测试等相关试题,试卷新、试题全、解析准,试题丰富,组卷方便快捷。-e卷通组卷网 falmouth group practice