arctan3等于多少π

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arctan3等于多少π
tan (arctan1/5+arctan3)的值等于

tan(arctan1/5+arctan3)=(tanarctan1/5+tanarctan3)/(1-tanarctan1/5tanarctan3)=(1/5+3)/(1-1/5*3)=8

求证arctan1+arctan2+arctan3=π.

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

arctan1+arctan2+arctan3=

设arctan1+arctan2+arctan3=x那么tanx=tan(arctan1+arctan2+arctan3)=(tan(arctan1+arctan2)+tan(arctan3))/(1-tan(arctan1+arctan2

tan(arctan1/5+arctan3)

由tan(arctanx)=x可得原式=[tan(arctan1/5)+tan(arctan3)]/[1-tan(arctan1/5)tan(arctan3)]=8

arctan1+arctan2+arctan3=?

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(arctan1/5+arctan3)=

tan(A+B)=(tanA+tanB)/(1-tanAtanB)tan(arctan1/5+arctan3)=(1/5+3)/(1-3/5)=8

求证arctan1+arctan2+arctan3=pai

证明:设arctan1+arctan2+arctan3=x那么tanx=tan(arctan1+arctan2+arctan3)=(tan(arctan1+arctan2)+tan(arctan3))/(1-tan(arctan1+arct

求arctan1+arctan2+arctan3的值

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+

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