tan (arctan1/5+arctan3)的值等于

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tan(arctan1/5+arctan3)的值等于tan(arctan1/5+arctan3)的值等于tan(arctan1/5+arctan3)的值等于tan(arctan1/5+arctan3)

tan (arctan1/5+arctan3)的值等于
tan (arctan1/5+arctan3)的值等于

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

tan(arctan3)=3, tan(arctan1/5)=1/5
tan (arctan1/5+arctan3)=[tan(arctan1/5)+tan(arctan3)]/[1-tan(arctan1/5)*tan(arctan3)]
=(1/5 +3)/(1-3/5)=8