arctan3等于多少π
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218767.014°
tan(arctan1/5+arctan3)=(tanarctan1/5+tanarctan3)/(1-tanarctan1/5tanarctan3)=(1/5+3)/(1-1/5*3)=8
因为arctan1=π/4只要证明arctan2+arctan3=3π/4即可,因为tan(arctan2+arctan3)=(2+3)/(1-2*3)=-1又π/4
设arctan1+arctan2+arctan3=x那么tanx=tan(arctan1+arctan2+arctan3)=(tan(arctan1+arctan2)+tan(arctan3))/(1-tan(arctan1+arctan2
由tan(arctanx)=x可得原式=[tan(arctan1/5)+tan(arctan3)]/[1-tan(arctan1/5)tan(arctan3)]=8
设tanA=1.tanB=2,tanC=3,D=A+BtanD=tan(A+B)=(1+2)/(1-1*2)=-3tan(A+B+C)=tan(D+C)=(-3+3)/(1+9)=0=>A+B+C=180度=》arctan1+arctan2
tan(A+B)=(tanA+tanB)/(1-tanAtanB)tan(arctan1/5+arctan3)=(1/5+3)/(1-3/5)=8
证明:设arctan1+arctan2+arctan3=x那么tanx=tan(arctan1+arctan2+arctan3)=(tan(arctan1+arctan2)+tan(arctan3))/(1-tan(arctan1+arct
设tanA=1.tanB=2,tanC=3,D=A+BtanD=tan(A+B)=(1+2)/(1-1*2)=-3tan(A+B+C)=tan(D+C)=(-3+3)/(1+9)=0=>A+B+C=180度∴arctan1+arctan2+
π=3.1415926535897932384626433832795
25.12取两位小数
15.70796325
π/3,
解题思路:初中数学中的π是一个准确值,不能用3.14代替,同时,除法要用分数线代替,并进行有关化简,即可解答。解题过程:
π=3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230
圆周率2500位圆周率500位3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821
cos2π=cos(2π+0)=cos0=1
182.212
π约等于3.141592653是无限不循环小数
60