cosπ等于几

荆虏供4273cos6/π是多少? -
阙子雄19799348666 ______ =√3/2

荆虏供4273cos派等于多少? -
阙子雄19799348666 ______ 根据你提到的COS和π,基本可以确定你问的是余弦函数.百 1. 首先需要明确,什么是COS. 角A的邻边比斜边 叫做∠A的余弦,记作度cosA(由余弦英文cosine简写得回来),即cosA=角A的邻边/斜边(直角三角形).记作cosA=x/r 2. 然后,我们利用三角形函数的定义圆,改变∠答A,使∠A向π运动,可以得出: cosA=x/r 当A=π,x=-|r|, cosπ=x/r=-|r|/r=-1 ∴cosπ=-1

荆虏供4273Cos(2013兀)等于多少? -
阙子雄19799348666 ______[答案] cos(2013π)=cos(π)= -1

荆虏供4273cosπ等于多少 怎么做的啊 -
阙子雄19799348666 ______ -1 你画一个那余炫函数图像就可以看出了

荆虏供4273sinπ等于多少来着?随之的还有cosπ,sin1/2π,cos1/2π,包括4/π还有前面都加上负号,以前学的,现在统统忘光了,希望给予解答, -
阙子雄19799348666 ______[答案] sinπ=0 cosπ=-1 sinπ/2=1 cosπ/2=0 sinπ/4=cosπ/4=根号2/2

荆虏供4273cos(π)= 多少,高手来
阙子雄19799348666 ______ cos(π)= -1

荆虏供4273cos派等于多少度? -
阙子雄19799348666 ______[答案] cos pai=cos 180度=-1

荆虏供4273cos2/3π等于几?
阙子雄19799348666 ______ cos2π/3 = cos 120°= -cos 60°= -1/2

荆虏供4273cosπ/12cos5π/12等于多少(过程) -
阙子雄19799348666 ______[答案] cosπ/12cos5π/12 =cos(π/2-5π/12)cos5π/12 =(cosπ/2cos5π/12+sinπ/2sin5π/12)cos5π/12 =sin5π/12cos5π/12 =1/2sin5π/6 =1/4

荆虏供4273cosπ\9·cos2π\9·cos3π\9·cos4π\9 等于多少? -
阙子雄19799348666 ______[答案] cosπ/9·cos2π/9·cos3π/9·cos4π/9 =(2sinπ/9cosπ/9·cos2π/9·cosπ/3·cos4π/9)/(2sinπ/9) =(2sin2π/9·cos2π/9·(1/2)·cos4π/9)/(4sinπ/9) =((1/2)2sin4π/9·cos4π/9)/(8sinπ/9) =((1/2)sin8π/9)/(8sinπ/9) =1/16